Transform matrix averaging methods

-Multiple Quaternion slerp
-Transform and scale lerp
Improvements to the average functionality
- Removed scale negative check
- Unified loops
Added matrix averaging to CHANGES
Merge pull request #1860 from ayberkozgur/tf-avg

Methods to enable averaging multiple transform matrices - part 2
Ouya gwt missing constants

Added missing constants for BUTTON_MENU and STICK_DEADZONE
Restored Gdx.net on resume and removed outdated stuff.
Merge pull request #1870 from davebaol/lwp

Restored Gdx.net on resume and removed outdated stuff.
Merge pull request #1869 from nbilyk/patch-1

Ouya gwt missing constants
fixed Ouya emulation in GWT
Add Colors to GWT module def
Add new stuff to Box2D wrapper (mostly MotorJoint)

Closes #1873
Add ghost vertices for EdgeShape

Closes #1153
Added a user-defined color.
Merge pull request #1880 from davebaol/color

Added user-defined color example.
Small optimization to avoid unnecessary square roots.
Merge pull request #1881 from davebaol/sqrt

Small optimization to avoid unnecessary square roots.
Everyone misspells my name :)
Merge pull request #1882 from davebaol/misspelled

Everyone misspells my name :)
Added convenience methods for normal/bump maps

Added the "missing" convenience methods to quickly create normal and bump maps.
They are not really helping that much, but it appears like a slight inconsistency to not have them.
Merge pull request #1883 from nooone/patch-1

Added convenience methods for normal/bump maps