JSCBC-80: Added missing touchMulti passthrough.

Change-Id: I5266e760787d63fb09612f4896d46d2fadfdc23c
Reviewed-on: http://review.couchbase.org/30362
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Brett Lawson <brett19@gmail.com>