PYCBC-105: Raw view API

Currently I've tagged the signatures as being unstable

Change-Id: I54a598b4f941fd0a01a85c799d6324d128b1e81a
Reviewed-on: http://review.couchbase.org/26365
Reviewed-by: Volker Mische <volker.mische@gmail.com>
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Mordechai Nunberg <mnunberg@haskalah.org>