Merge "Android Studio 2.1 release notes and downloads." into mnc-mr-docs am: c939dd0 am: 19f9481
am: 88b2780

* commit '88b27807cc248607f713e97b1791186fc7e37313':
  Android Studio 2.1 release notes and downloads.

Change-Id: I55b8646648edbd6657b5bb781c6a239a828fe782