Merge "Android Studio 2.1 release notes and downloads. am: 8e48332 am: beab847 am: 6461bca am: 7499bc7" into nyc-dev
am: 504bcb1

* commit '504bcb19fec6db092b1c8998bcf89a6f72be850e':
  Android Studio 2.1 release notes and downloads.

Change-Id: I8e1a96ee19a58062438533f1edadc617b5a32e0d