Release: version 1.15.1.0
Release: version 1.15.1.1
Release: version 1.15.2.0
Release: version 1.15.2.1
Merge branch 'master' of github.com:mopub/mopub-android-sdk

Conflicts:
	mopub-sdk/src/main/java/com/mopub/mobileads/AdViewController.java