Replace trunk files with 2.1. (Readme still from 2.0.3)

git-svn-id: https://plugins.svn.wordpress.org/buddypress/trunk@992756 b8457f37-d9ea-0310-8a92-e5e31aec5664
Bump stable version to 2.1

git-svn-id: https://plugins.svn.wordpress.org/buddypress/trunk@992758 b8457f37-d9ea-0310-8a92-e5e31aec5664