Two cleanups in couch_db_updater
Two cleanups in couch_db_updater

It also seems to add a little performance gain:

http://graphs.mikeal.couchone.com/#/graph/8bf31813eef7c0b7e37d1ea259020a0

Closes COUCHDB-1000


git-svn-id: c1f8a8ec0b3bb2e99ab3413722f81f687760e79c@1053731 13f79535-47bb-0310-9956-ffa450edef68

KlausTrainer/couchdb-couch,smithsz/couchdb-couch,fkaempfer/couchdb,fkaempfer/couchdb,alanning/couchdb-couch,KlausTrainer/couchdb-couch,smithsz/couchdb-couch,alanning/couchdb-couch,smithsz/couchdb-couch,ngpestelos/couchdb-couch,apache/couchdb-couch,apache/couchdb-couch,apache/couchdb-couch,KlausTrainer/couchdb-couch,fkaempfer/couchdb,cloudant/couchdb-couch,cloudant/couchdb-couch,fkaempfer/couchdb,ngpestelos/couchdb-couch,fkaempfer/couchdb,fkaempfer/couchdb,ngpestelos/couchdb-couch,alanning/couchdb-couch,cloudant/couchdb-couch