Introduce a way to pass in an existing mongodb.Db
Driver update
Use default write concern w:1
Pull var db one scope up
Increment version
use opt.db instead of opt.dbConn, no need to introduce more names
Merge pull request #1 from hannesgassert/feature/mongo-dbconn

Update from upstream & add a way to pass in an existing DB Connection
Merge branch 'master' of github.com:skimcom/mojo into skim-beta