Fixes in GWT backend:
-added log configuration with GwtApplicationConfiguration.log
-more accurate value of GwtGraphics.getDensity()
-Skin emulation takes NinePatch padding into account (copy-paste from not emulated class)
-fixed filtering of asset files in PreloaderBundleGenerator
Merge branch 'master', remote-tracking branch 'origin/master'
add minimized pause
modify structure and add sync
Changed theme in gwt backend to chrome theme with "gwt-" prefixed classes only
addressed @bitiotic comment to use local variable
delete extra whitespace in empty line
Improved commentary about theme inheritance
use framerate instead of explicit boolean
Issue 1104: increase consistency in overlaps, intersects and contains
Issue 1104: #intersectRectangles does the same thing as #overlap(Rectangle,Rectangle)
reorder methods
chain individual statements together
some informal tests to illustrate the difference in #contains and #overlaps between the various regions
issue-1104 touching circles do not overlap
issue-1104 points on the border count as 'contained'
issue-1104 touching BoundingBoxes are not 'contained', rewrite BoundingBox#contains in same form as others
issue-1104 add Circle#contains(Circle)
Add flexibility for BatchTiledMapRenderer users.

User may provide their own SpriteBatch in the constructor. Also, added
setMap method to allow the map to be changed. This makes sense for
renderers backed by SpriteBatch since nothing about the map is cached in
the renderer.
Change TmxMaploader to an AsynchronousAssetLoader