Refactor: rename remove() to rmrf()

Due to problems with the namespace of remove

Change-Id: I06a2daec2900841d4dc04376c92f9a672b2b0227
Reviewed-on: http://review.couchbase.org/31544
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>