Using upsert rather than insert when saving user to database.
Files unused.
Bug fix in user initialization.
Improvements in file upload and md5 calculation.
Modifications to get all existing tests working.
go fmt changes
Pulling mongo error message from mgo package to ensure it does not change.  Also, standardized the error handling when a node does not exist in mongo.
Update to version number
Merge pull request #221 from jaredbischof/master

Various updates including performance improvement for md5 checksum calculation.