Use node::MakeCallback

These wrappers around ->Call are supposed to be used as they allow
proper handling of domains and nextTick. They also handle the TryCatch
stuff as well.

Change-Id: I5d1357801a07003dd1a40f986f52e1191d560947
Reviewed-on: http://review.couchbase.org/29047
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>