updated gradle, android plugin, androidannotations

* updated gradle to 1.5
* gradle-android-plugin to 1.2.2-SNAPSHOT (support for ADT 21.1)
* androidannotations 3.0-SNAPHSOT (package updated to org.androidannotations)
* changed repos to local as androidannotations require fix for https://github.com/excilys/androidannotations/issues/577