Added an undefined progress bar icon.
Added Notification widget.
Minor UI widgets improvements.
Use foreach instead of iterators for Model iteration
 * Model.getIndex() is now Model.listNamedEntities()
 * it is an Iterable instead of an Iterator
 * updated dependencies
Fix index (closes #362)  * now uses Lucene 3.6.2 + lucene-analyzers  * search is full-substring instead of prefix-only  * entire object hierarchy is indexed
Merge pull request #445 from manuel-freire/fix-index-test

Fix index test
Merge pull request #456 from RotaruDan/notifications

Notifications
Added check to OpenGame to ensure EditState has a editScene
Merge pull request #461 from anserran/editopen

Added check to OpenGame to ensure EditState has a editScene
Initialize, release and build timelines added to the tweens widget.
Adapted TweenButton and TweenDragButton in order to get initialized correctly.
Improved tween functionality code readability.
A first approach to a repository implementation.
ElementButton improvements.
Download, unzip and display the repository thumbnails.
Fixed Android skin loading path.
Added I18N strings.
Added selectable flag for BaseGallery.
Improved RepositoryGallery.
RepositoryGallery refactoring and javadocs. Now resources are fetched locally before downloading them.