Added a VirtualViewport to help with keeping the aspect ratio and
handling a fixed viewport.
Merge remote-tracking branch 'upstream/master'
Added viewports with tests.
Removed the old VirtualViewport utility.
Added StaticViewport and changed the viewport architecture in total
Merge branch 'master' of https://github.com/libgdx/libgdx
Merge pull request #1504 from nooone/master

Viewports