Build: Enable "unused" option in jshint - Remove unused variables from codebase. - Closes gh-788

Squashed commit of the following:

commit 7f19f92c646f180bc067bb24123175251a64a9d6
Author: Mike Sherov <mike.sherov@gmail.com>
Date:   Tue Oct 23 10:34:28 2012 -0400

    put back in fake args for signatures that we want to keep

commit 257505a9e69da0c53e3a989dab87a13112045a29
Author: Mike Sherov <mike.sherov@gmail.com>
Date:   Tue Oct 23 08:10:20 2012 -0400

    changes per @scott_gonzalez

commit 12725480cb58e70865e5aa6e735009b6b035c8f3
Author: Mike Sherov <mike.sherov@gmail.com>
Date:   Mon Oct 22 22:54:05 2012 -0400

    clean up unused vars in ui directory

commit 563595e7aee5d4a5c096b2d1de655abdf920aacd
Author: Mike Sherov <mike.sherov@gmail.com>
Date:   Mon Oct 22 22:37:42 2012 -0400

    clean up unused vars in grunt and tests

9 files changed, 34 insertions, 34 deletions

diff --git a/ui/.jshintrc b/ui/.jshintrc
index 26b808774..edf09721b 100644
--- a/ui/.jshintrc
+++ b/ui/.jshintrc
@@ -10,6 +10,7 @@
 	"onevar": true,
 	"trailing": true,
 	"undef": true,
+	"unused": true,
 	"predef": [
 		"Globalize"
 	]
diff --git a/ui/jquery.ui.accordion.js b/ui/jquery.ui.accordion.js
index a23d5e66d..108647419 100644
--- a/ui/jquery.ui.accordion.js
+++ b/ui/jquery.ui.accordion.js
@@ -603,7 +603,7 @@ if ( $.uiBackCompat !== false ) {
 				_create.call( this );
 			},
 
-			_setOption: function( key, value ) {
+			_setOption: function( key ) {
 				if ( key === "autoHeight" || key === "clearStyle" || key === "fillSpace" ) {
 					this.options.heightStyle = this._mergeHeightStyle();
 				}
diff --git a/ui/jquery.ui.autocomplete.js b/ui/jquery.ui.autocomplete.js
index aec12bf8f..7bacca006 100644
--- a/ui/jquery.ui.autocomplete.js
+++ b/ui/jquery.ui.autocomplete.js
@@ -359,7 +359,7 @@ $.widget( "ui.autocomplete", {
 					url: url,
 					data: request,
 					dataType: "json",
-					success: function( data, status ) {
+					success: function( data ) {
 						response( data );
 					},
 					error: function() {
@@ -541,7 +541,7 @@ $.widget( "ui.autocomplete", {
 		return this.menu.element;
 	},
 
-	_value: function( value ) {
+	_value: function() {
 		return this.valueMethod.apply( this.element, arguments );
 	},
 
diff --git a/ui/jquery.ui.dialog.js b/ui/jquery.ui.dialog.js
index e234464ad..f2e3f945f 100644
--- a/ui/jquery.ui.dialog.js
+++ b/ui/jquery.ui.dialog.js
@@ -88,6 +88,11 @@ $.widget("ui.dialog", {
 			options = this.options,
 
 			title = options.title || " ",
+			uiDialog,
+			uiDialogTitlebar,
+			uiDialogTitlebarClose,
+			uiDialogTitle,
+			uiDialogButtonPane;
 
 			uiDialog = ( this.uiDialog = $( "<div>" ) )
 				.addClass( uiDialogClasses + options.dialogClass )
@@ -108,13 +113,13 @@ $.widget("ui.dialog", {
 				.mousedown(function( event ) {
 					that.moveToTop( false, event );
 				})
-				.appendTo( "body" ),
+				.appendTo( "body" );
 
-			uiDialogContent = this.element
+			this.element
 				.show()
 				.removeAttr( "title" )
 				.addClass( "ui-dialog-content ui-widget-content" )
-				.appendTo( uiDialog ),
+				.appendTo( uiDialog );
 
 			uiDialogTitlebar = ( this.uiDialogTitlebar = $( "<div>" ) )
 				.addClass( "ui-dialog-titlebar  ui-widget-header  " +
@@ -123,7 +128,7 @@ $.widget("ui.dialog", {
 					// Dialog isn't getting focus when dragging (#8063)
 					uiDialog.focus();
 				})
-				.prependTo( uiDialog ),
+				.prependTo( uiDialog );
 
 			uiDialogTitlebarClose = $( "<a href='#'></a>" )
 				.addClass( "ui-dialog-titlebar-close  ui-corner-all" )
@@ -132,23 +137,23 @@ $.widget("ui.dialog", {
 					event.preventDefault();
 					that.close( event );
 				})
-				.appendTo( uiDialogTitlebar ),
+				.appendTo( uiDialogTitlebar );
 
-			uiDialogTitlebarCloseText = ( this.uiDialogTitlebarCloseText = $( "<span>" ) )
+			( this.uiDialogTitlebarCloseText = $( "<span>" ) )
 				.addClass( "ui-icon ui-icon-closethick" )
 				.text( options.closeText )
-				.appendTo( uiDialogTitlebarClose ),
+				.appendTo( uiDialogTitlebarClose );
 
 			uiDialogTitle = $( "<span>" )
 				.uniqueId()
 				.addClass( "ui-dialog-title" )
 				.html( title )
-				.prependTo( uiDialogTitlebar ),
+				.prependTo( uiDialogTitlebar );
 
 			uiDialogButtonPane = ( this.uiDialogButtonPane = $( "<div>" ) )
-				.addClass( "ui-dialog-buttonpane ui-widget-content ui-helper-clearfix" ),
+				.addClass( "ui-dialog-buttonpane ui-widget-content ui-helper-clearfix" );
 
-			uiButtonSet = ( this.uiButtonSet = $( "<div>" ) )
+			( this.uiButtonSet = $( "<div>" ) )
 				.addClass( "ui-dialog-buttonset" )
 				.appendTo( uiDialogButtonPane );
 
@@ -350,8 +355,7 @@ $.widget("ui.dialog", {
 	},
 
 	_createButtons: function( buttons ) {
-		var uiDialogButtonPane, uiButtonSet,
-			that = this,
+		var that = this,
 			hasButtons = false;
 
 		// if we already have a button pane, remove it
diff --git a/ui/jquery.ui.effect.js b/ui/jquery.ui.effect.js
index 8d875746e..37ca48795 100644
--- a/ui/jquery.ui.effect.js
+++ b/ui/jquery.ui.effect.js
@@ -245,8 +245,7 @@ color.fn = jQuery.extend( color.prototype, {
 
 		var inst = this,
 			type = jQuery.type( red ),
-			rgba = this._rgba = [],
-			source;
+			rgba = this._rgba = [];
 
 		// more than 1 argument specified - assume ( red, green, blue, alpha )
 		if ( green !== undefined ) {
@@ -427,7 +426,7 @@ color.fn = jQuery.extend( color.prototype, {
 			rgba.push( ~~( alpha * 255 ) );
 		}
 
-		return "#" + jQuery.map( rgba, function( v, i ) {
+		return "#" + jQuery.map( rgba, function( v ) {
 
 			// default to 0 when nulls exist
 			v = ( v || 0 ).toString( 16 );
@@ -501,8 +500,7 @@ spaces.hsla.from = function ( hsla ) {
 		l = hsla[ 2 ],
 		a = hsla[ 3 ],
 		q = l <= 0.5 ? l * ( 1 + s ) : l + s - l * s,
-		p = 2 * l - q,
-		r, g, b;
+		p = 2 * l - q;
 
 	return [
 		Math.round( hue2rgb( p, q, h + ( 1 / 3 ) ) * 255 ),
@@ -710,7 +708,6 @@ function getElementStyles() {
 			this.currentStyle,
 		newStyle = {},
 		key,
-		camelCase,
 		len;
 
 	// webkit enumerates style porperties
@@ -1114,7 +1111,7 @@ function standardSpeed( speed ) {
 }
 
 $.fn.extend({
-	effect: function( effect, options, speed, callback ) {
+	effect: function( /* effect, options, speed, callback */ ) {
 		var args = _normalizeArguments.apply( this, arguments ),
 			mode = args.mode,
 			queue = args.queue,
diff --git a/ui/jquery.ui.slider.js b/ui/jquery.ui.slider.js
index eb0f7fc15..18f7113d4 100644
--- a/ui/jquery.ui.slider.js
+++ b/ui/jquery.ui.slider.js
@@ -278,7 +278,7 @@ $.widget( "ui.slider", $.ui.mouse, {
 		return true;
 	},
 
-	_mouseStart: function( event ) {
+	_mouseStart: function() {
 		return true;
 	},
 
@@ -591,7 +591,7 @@ $.widget( "ui.slider", $.ui.mouse, {
 			_set = {};
 
 		if ( this.options.values && this.options.values.length ) {
-			this.handles.each(function( i, j ) {
+			this.handles.each(function( i ) {
 				valPercent = ( that.values(i) - that._valueMin() ) / ( that._valueMax() - that._valueMin() ) * 100;
 				_set[ that.orientation === "horizontal" ? "left" : "bottom" ] = valPercent + "%";
 				$( this ).stop( 1, 1 )[ animate ? "animate" : "css" ]( _set, o.animate );
diff --git a/ui/jquery.ui.tabs.js b/ui/jquery.ui.tabs.js
index 05456374d..0d920c3a1 100644
--- a/ui/jquery.ui.tabs.js
+++ b/ui/jquery.ui.tabs.js
@@ -45,8 +45,7 @@ $.widget( "ui.tabs", {
 	},
 
 	_create: function() {
-		var panel,
-			that = this,
+		var that = this,
 			options = this.options,
 			active = options.active,
 			locationHash = location.hash.substring( 1 );
@@ -295,8 +294,7 @@ $.widget( "ui.tabs", {
 	},
 
 	refresh: function() {
-		var next,
-			options = this.options,
+		var options = this.options,
 			lis = this.tablist.children( ":has(a[href])" );
 
 		// get disabled tabs from class attribute from HTML
@@ -922,7 +920,7 @@ if ( $.uiBackCompat !== false ) {
 			this._super();
 		},
 
-		url: function( index, url ){
+		url: function( index ){
 			this.anchors.eq( index ).removeData( "cache.tabs" );
 			this._superApply( arguments );
 		}
@@ -1158,7 +1156,7 @@ if ( $.uiBackCompat !== false ) {
 			}
 		},
 
-		_eventHandler: function( event ) {
+		_eventHandler: function() {
 			this._superApply( arguments );
 			this.options.selected = this.options.active;
 			if ( this.options.selected === false ) {
@@ -1254,7 +1252,7 @@ if ( $.uiBackCompat !== false ) {
 				this._cookie( this.options.active, this.options.cookie );
 			}
 		},
-		_eventHandler: function( event ) {
+		_eventHandler: function() {
 			this._superApply( arguments );
 			if ( this.options.cookie ) {
 				this._cookie( this.options.active, this.options.cookie );
diff --git a/ui/jquery.ui.tooltip.js b/ui/jquery.ui.tooltip.js
index 4a17f1f20..43788a082 100644
--- a/ui/jquery.ui.tooltip.js
+++ b/ui/jquery.ui.tooltip.js
@@ -284,7 +284,7 @@ $.widget( "ui.tooltip", {
 					this.close( fakeEvent, true );
 				}
 			},
-			remove: function( event ) {
+			remove: function() {
 				this._removeTooltip( tooltip );
 			}
 		};
@@ -297,7 +297,7 @@ $.widget( "ui.tooltip", {
 		this._on( target, events );
 	},
 
-	close: function( event, force ) {
+	close: function( event ) {
 		var that = this,
 			target = $( event ? event.currentTarget : this.element ),
 			tooltip = this._find( target );
diff --git a/ui/jquery.ui.widget.js b/ui/jquery.ui.widget.js
index 96cc6071c..59fd81b9e 100644
--- a/ui/jquery.ui.widget.js
+++ b/ui/jquery.ui.widget.js
@@ -200,7 +200,7 @@ $.widget.bridge = function( name, object ) {
 	};
 };
 
-$.Widget = function( options, element ) {};
+$.Widget = function( /* options, element */ ) {};
 $.Widget._childConstructors = [];
 
 $.Widget.prototype = {