- add descriptions to metrics - move document_* metrics to couch_db module and merge them into database_* metrics
- add descriptions to metrics
- move document_* metrics to couch_db module and merge them into database_* metrics

git-svn-id: c1f8a8ec0b3bb2e99ab3413722f81f687760e79c@748217 13f79535-47bb-0310-9956-ffa450edef68

apache/couchdb-futon,apache/couchdb-futon