Adds TransitionManager.
Adds some useful transitions.
ChangeMockupView action receives a Transition.
Controller manages a list of Disposables.
Adds meaningful transitions between Mokap views.
Slightly improved GalleryItem style.
DropDown no longer blocks input.
Improves ColorPicker to display recently used colors.
Changed skin and fixed a minor Windows bug.
Fixed LinearLayout, now considers the background padding.
Renamed the IconWithScalePanel
Added HorizontalToolbar widget.
Changed the old IconWithScalePanel and added a test.
Added MultiHorizontalToolbar.
Merge pull request #801 from RotaruDan/galleryStyle

Improves ColorPicker to display recently used colors.
Merge pull request #800 from gorco/widgets

Widgets
Merge pull request #798 from RotaruDan/meaningfulTransitions

Meaningful transitions
IconWithPanel with scale refactoring. Created BaseIconWithPanel also improved show and hide animations.
Small MockupUI test improvements.
Removed unnecessary static field in IconWithPanel.