Allow 0 to be passed without unit

This commit finish fixing issue #552. It makes it unnecessary to specify a
unit with 0 when interacting with another SVG.Number that has a unit.

This was accomplished by modifying the operation methods of SVG.Number to
allow them to use the unit of the passed number when this number as no unit.

1 files changed, 9 insertions, 5 deletions

diff --git a/dist/svg.js b/dist/svg.js
index 6a9ae01..e540a33 100644
--- a/dist/svg.js
+++ b/dist/svg.js
@@ -6,7 +6,7 @@
 * @copyright Wout Fierens <wout@mick-wout.com>
 * @license MIT
 *
-* BUILT: Mon Feb 20 2017 15:25:03 GMT+0100 (Mitteleuropäische Zeit)
+* BUILT: Wed Feb 22 2017 00:19:11 GMT-0500 (EST)
 */;
 (function(root, factory) {
   if (typeof define === 'function' && define.amd) {
@@ -974,19 +974,23 @@ SVG.Number = SVG.invent({
     }
     // Add number
   , plus: function(number) {
-      return new SVG.Number(this + new SVG.Number(number), this.unit)
+      number = new SVG.Number(number)
+      return new SVG.Number(this + number, this.unit || number.unit)
     }
     // Subtract number
   , minus: function(number) {
-      return this.plus(-new SVG.Number(number))
+      number = new SVG.Number(number)
+      return new SVG.Number(this - number, this.unit || number.unit)
     }
     // Multiply number
   , times: function(number) {
-      return new SVG.Number(this * new SVG.Number(number), this.unit)
+      number = new SVG.Number(number)
+      return new SVG.Number(this * number, this.unit || number.unit)
     }
     // Divide number
   , divide: function(number) {
-      return new SVG.Number(this / new SVG.Number(number), this.unit)
+      number = new SVG.Number(number)
+      return new SVG.Number(this / number, this.unit || number.unit)
     }
     // Convert to different unit
   , to: function(unit) {