Added collinear,opposite,same direction function to vector3
Added extract/copy Matrix4x3 to Matrix4x4
Fixed Camera lookAt bug
Fixed collinear, perpendicular methods
Added methods to Vector2 and Vector interface
Added gwt method to extract 4x3 matrix
Added getters.

closes #1350
Merge branch 'origin/master'
Allow setting the background without changing padding.
Draw the background after the transform is applied.

No longer need to wrap a button in a table/container to use transform.
#1336
Vertical/HorizontalGroup got pad, fill and an API similar to Table/Container.

#1336
Added support for dynamic resources to SkinLoader
Merge pull request #1354 from davebaol/master

Added support for dynamic resources to SkinLoader
Fixes 1351
Fixes 1353
Merge pull request #1356 from xoppa/various

Small changes in AnimationController
Added isZero function to MathUtils
Fix to Vector3 methods
Fix to getScale function Matrix4
Merge pull request #1342 from lordjone/test

Math and Camera
Fix javadocs
Merge pull request #1358 from xoppa/various

Fix javadocs