Upgraded gradle tools to support Android Studio 1.0
Updated proguard usage to new gradle version.
Changelog updated.
Adding full stops to changelog
Merge branch 'master' of github.com:realm/realm-java into cm-android-studio-1.0

Conflicts:
	changelog.txt
Merge pull request #664 from realm/cm-android-studio-1.0

Gradle upgraded to support Android Studio 1.0