AssetManager now ignores subsequent dependencies if there are duplicates.

closes #1185
GWT: Fixed SuperJumper compile error

System.nanoTime() is not implemented in GWT. Switched to TimeUtils instead
Merge pull request #1294 from Unkn0wn0ne/patch-14

GWT: Fixed SuperJumper compile error
Updated HeaderFixer to the current year
Merge pull request #1297 from Unkn0wn0ne/headerfixer

Updated HeaderFixer to the current year
Fix AndroidVisibilityListener's Javadoc

Old description wasn't 100% accurate
Merge pull request #1298 from Unkn0wn0ne/patch-17

Fixed AndroidVisibilityListener's Javadoc
Revert using Matrix4#set(pos, rot, scl)

Closes #1289 revert change on https://github.com/libgdx/libgdx/commit/4d68f533b201860294970280e02b41da2c75bf7e