Update README for 1.2.0

[Jason Voegele]

Hi all, I have recently merged all pending pull requests for gradle-android-plugin and I would like to push the 1.2.0 release out the door. Before doing this, though, we need to address https://github.com/jvoegele/gradle-android-plugin/issues/62 , which is to update the README for the plugin with recent and accurate information.

Can anyone who has been involved with any changes to the plugin since the last release please take a moment and update the README as appropriate?

Thanks!

-- 

Jason Voegele

The honeymoon is not actually over until we cease to stifle our sighs

and begin to stifle our yawns.

-- Helen Rowland