This incorporates the last hunk of qt-creator/merge_requests/180 by Nikita V.

Merge-request: 179
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

The Qt4ProjectManager still depends on the QMLJsEditor for building.
Since the Qt4ProjectManager does cope correctly with not
finding a ModelManager, the Qt4ProjectManager will continue to work even
without the qmljseditor.

Note: The load order between qt4projectmanager and qmljseditor is undefined
now. This is not a problem for this particular patch, but might break
future code in subtle ways.

This reverts commit f8c50013.

ids are now checked if they are a qml keyword

sci files are now supportted for BorderImage

Add XML-elements allowing for Javascript-based
validation rules along with error messages.
Rubber-stamped-by: Erik Verbruggen <erik.verbruggen@nokia.com>

Add legacy to retrieve old values.

Task-number: QTCREATORBUG-2456

In some cases snippets have a description. Due to the sorting this
already places them after keywords. So this is just to be consistent
for all cases.

Reviewed-by: Roberto Raggi

Not really visible to the user, but lead to double activation on clicking.

Task-Nr: QTCREATORBUG-1130

Reviewed-by: Roberto Raggi

Task-number: QTCREATORBUG-2454

- Move RSSFetcher to CorePlugin
- Rename RSSFetcher to RssFetcher
- Make RssFetcher more generic, allow multiple sources to be fetched
- Introduce Featured Items on Getting Started page
- Introduce dummy entry for Mobile examples, needs implementation once they are ready

Fix commiting with Author and Email set on Windows.

Task-number: QTCREATOR-2397

Update screen shot.

Reviewed-by: Lasse Holmstedt