Updated to Gradle 1.9 and gradle tools 0.7 for android studio 0.4.1+ compatibility

Need to update the Gradle tools to 1.9 and the tools to 0.7 to ensure
compatibility with Android studio 0.4.1 and above. More at
http://tools.android.com/recent/androidstudio041released

Imports/builds with the newer version of android studio will not work without this.