Merge pull request #57 from metc/master

Cleanup and Travis CI build added
Update README.md
Force to use Java 1.6 when compiling the library, like in the students lab.
no message
Revert "no message"

This reverts commit e4740c82ea9a967986e597c66a5ed37658dfc37b.
Merge branch 'master' of https://github.com/pmudry/gdx2d
Fix #60
Update README.md

Travis-CI image link updated.
SDK 16 is enough on Android
On Windows, DemoSelector can be bigger
Demos updated and fixed for Android.
HelloAndroid application renamed and Proguard configuration file added.
The application can be exported as a signed APK now.
Proguard configuration added. The application can be exported as a signed APK to the GooglePlay. Many demos fixed.
Added polygon management library, first test added as well
Merge branch 'master' of https://github.com/pmudry/gdx2d

Conflicts:
	gdx2d-android/AndroidManifest.xml
Removed polygon stuff. Ain't nobody got time for this
API level 16 specified, no reason why higher version should be used.
Removed unused variable
Merge pull request #1 from hevs-isi/master

Android fixes