DOC-13: Updating master branch to use correct 3.0 READMEs.
MB-12291: Change reference to forums.couchbase.org.

Change-Id: Ic97a37a9179fb25e47fbb7e6d33c9460876774a8
Reviewed-on: http://review.couchbase.org/43591
Reviewed-by: Chris Hillery <ceej@couchbase.com>
Tested-by: Chris Hillery <ceej@couchbase.com>