Improve performance of the lwjgl backend
update changes
Added resource removal from Skin object
Merge pull request #1606 from cobolfoo/master

Added resource removal from Skin object
Fixed parsing null.

closes #1608
Merge branch 'origin/master'
Merge pull request #1605 from Tom-Ski/meow

Improve empty while loop performance in the lwjgl backend
Remove old test code
Set key event timestamp
Reduce lwjgl backend performance
Added rows parameter to set preferred height for TextArea
Visual pressed only affects presses shorter than the visual press duration.

#1612
Merge branch 'origin/master'
Merge pull request #1609 from anserran/rowscolumns

More control over preferred size in TextField and TextArea
Migrated the RoboVM backend to use the new CocoaTouch bindings.
Updated the iOS versions of all demos to use the new RoboVM CocoaTouch bindings.
Merge pull request #1613 from semtiko/patch-1

Lwjgl backend is too fast
Merge pull request #1611 from davebaol/branch1

Set key event timestamp
toArray methods.
Fixed packing directory cleanign and creation.