Misc. README fixes.

Change-Id: I98d77e8b1d9f61a32d9045833b866c7f01db57c9
Reviewed-on: http://review.couchbase.org/31702
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>