adding the ability to specify roles when adding/modifying a mongo user
adding comment about required version of mongodb to use the roles param
adding fixes to support older versions of mongo (and pymongo) as well as new versions
Fixing up a small issue with the mongodb_user docs
Comparison data type mismatch corrected
Replacement for apt_repository.
1. Debian Squeeze is supported out of box now.
2. Repository type "deb" or "deb-src" should be explicitly specified.
3. If a source had beed added it must be possible to remove it.
4. PPA can be only used against Ubuntu hosts.
Reverting version_added field in the apt_repository module