Android Version 4.1.1
Merge branch 'master' into android_4.1.1

* master:
  Upgrade chartboost ios to 5.0.2
  iOS Version 4.5.1
Update android version to 5.0.3
Make back button close interstitials
Merged in android_5.0.3 (pull request #1)

Update android sdk to 5.0.3