Make API3 stable
Make API3 stable

This makes the API3 symbols stable. The API will be moved over to
'couchbase.h' in a later commit.

Change-Id: I5486732bb2f364ecd660e3c8526079de8036d29e
Reviewed-on: http://review.couchbase.org/59102
Tested-by: Mark Nunberg <dab05a0fe859c5cb93882b2a75a0d613501b07be@couchbase.com>
Reviewed-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>

kojiromike/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,kojiromike/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,mody/libcouchbase,avsej/libcouchbase,mody/libcouchbase,couchbase/libcouchbase,mody/libcouchbase,mody/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,avsej/libcouchbase