Changed createUser schema to 2.6 version, as stated in http://stackoverflow.com/questions/23468137/how-to-add-authentication-to-mongodb-2-6
createUser fix role
"db" is not a valid argument to createUser
"credentials" is not a valid argument to createUser
Change password if user exists
Change password if user exists
Error in roles, now dbOwner
Test if user exists
Undo last commit.
Merge branch 'hotfix/create_command_schema' into hotfix/create_user_mongodb_261