Fixes TravisCI errors.
Merge pull request #802 from RotaruDan/buildFix

Fixes TravisCI errors.
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.
wip