Temporarily downgrade to GDX Stable 1.0.1

Nightly has some strange error with PolygonShapes
Instantiate DummyMenu with LevelManager

Also fix null error involving InfiniteScrollingLevelScreen constructors
Use if statements instead of exception handling
Some formatting changes, renamed variables, clean imports
Remove method that thankfully hasn't done any harm yet
Bump number of android build tools
Fix Travis badge to show builds for develop

[ci skip]
Merge branch 'develop' into gobutton

Conflicts:
	core/src/com/sweatyreptile/losergame/entities/Player.java
Functional GO button in the menu

Use fixture wrappers in order to call isPlayer() and getPlayer() on a
fixture

GO button establishes that the duck is quacking and in contact, then
calls level("test_home") to switch to the first level