* Remove outdated filtering concepts

withFilter is removed since filters are supposed to be set as state in
the data provider instead of by wrapping.

AppendabileFilterDataProvider is removed since the data provider is
supposed to do any appending when updating its own state instead of
through wrapping.

This is one of many steps towards #8245

* Migration guide 1st draft

* Restructure and improve migration guide

* Update migrating-to-vaadin8.asciidoc

Also updates ComboBox.setItems to use these new shorthands

This is one of many steps towards #8245

* Add a data provider wrapper with a configurable filter

This is one of many steps towards #8245

* Overload AbstarctComponent.setDescription() with content mode parameter

Fixes #8185

* Introduce DateTimeFile and InlineDateTimeField.

Fixes #8132

* Correct and provide declarative tests.

* Provide a date converter and UI tests.

* Change BackEndDataProvider into an interface

BackEndDataProvider is now an interface with methods for setting
sorting options based on SortOrder instances. 

AbstractBackEndDataProvider stores sorting options, combines them with
the sorting provided in the query and invokes its own abstract fetch and
size methods.

CallbackDataProvider implements a BackEndDataProvider based on two
lambdas.

This is one of many steps towards #8245

* Allow setting filters directly in ListDataProvider

This is one of many steps towards #8245

* Simplified javadoc

* Better instructions in widgetset optimization view in the debug window.

The generated example code is ok, but steps to use them are not obvious.
Added more details to debug window instructions to make it clear what steps are
needed to optimize the widgetset.

Change-Id: Id46632697044223092ef772f98b1fcd69c28d0da

* Make data providers statefull with regards to default sort orders

This is one of many steps towards #8245

* Add getHeaderCellByCaption method to tb-api GridElement

* Add separate modules to test Bean Validation lib necessity.

Fixes #8141

Closes #8232

Without this, maven.compiler.source will not be set to 1.8 which
sometimes seems to make Eclipse think it should use Java 5 compiler
settings for the project, causing various issues.

* Removed obsolete 'Setting up the Development Environment' link in tutorial'

* Added support for HTML5 push/replaceState for proper deep linkin features

* Automated test script now works at least on chrome

* Uses html5 push/popstate to implement uri fragment feature

* fire legacy fragment change events also via popstate events rpc calls
* send new fragments via pushstate mechanism

* formatting

* Formatting and adding test and workaround for IE bug

* Formatting and depracated UriFragmentListener

* Aligned naming in the new API

* Ignored IE due to web driver bug

Tested a workaround with javascript based window.location.href fetch,
but that don’t seem to work stable enough.

* Add "deselect allowed" feature to the Grid.

Fixes #8149

Fixes #7005

* Replace Listing with HasDataProvider and HasFilterableDataProvider

The type parameters of the Listing interface does in practice mean that
it isn't useful for anything. This patch replaces that interface with
separate types for components that require filterable data providers and
components that support any kind of data provider.

The setItem methods are extracted to a common interface that is also
directly implemented by AbstractListing.

* Fix TestBench API imports, move functionality from custom elements

* Fixes to TestBench APIs and JavaDocs

* Merge remote-tracking branch 'origin/master' into 578_tbapi_cleanup

* Fix method name in CheckBoxGroupTest

* Remove unused custom element classes

* Implement getOptions using getOptionElements

* Replace setValue with setSelection in CheckBoxGroupElement

* Rename CheckBoxGroupElement getSelection to getValue

* Fix one last method

* Avoid using Guava API in the documentation

* Include old value in ValueChangeEvent

Mention "Allow edits from maintainers" checkbox.
Talk about pull requests instead of patches where it makes sense.

* Integrate BeanBinder functionality into Binder

* Fix broken Grid documentation addColumn setHeaderCaption

* Remove unused private method

Contains some additional tests and element changes based on review.

* Fix OSGi configuration for Liferay 7

* Correctly reset DataCommunicator when its DataProvider is changed

* Improve ReplaceDataProviderTest

* Remove return type from AbstractListing.readItems

* Exclude GAE packages from OSGi imports

Fixes #8092

Fixes #8129

First round for #8132.

* Allow AbstractField to override value equality

Fixes #8089

Minor documentation fixes.

Use plugin management for maven plugin, remove version numbers

This patch applies following fixes:
* ContextMenu with correct version for Vaadin 8
* Correctly skip install plugin for test submodules
* Make widgetset-test-util a test depdendency, don't use test-jar
* Fix vaadin-test project structure and dependencies
* Clean up testutil pom
* Add README.md

It's an implementation detail that UriFragmentManager uses a
UriFragmentChangedListener, so this shouldn't be exposed in its public
API.