fix for issue #277,
- cleaned the LDAP code a little

unified generation of repo groups choices
added on-the-fly conversion to new repository groups format (supporting path as a link)

fixes #265 ldap save fails sometimes on converting attributes to booleans, added getter and setter
into model that will provent from this errors on db model level

Added header for redhat init.d script
Updated contributors

Added friendly message about removing a group that still contains subgroups.
Fixed option to remove a group that is not in filesystem (ex. someone deleted it intentionally on filesystem) in this case RhodeCode will simply just throw an error message saying this group cannot be deleted.

implements #226 repo groups available by path
fixes #259 Groups with the same name but with different parent group

fixed issues with python2.5
added compat module to rhodecode to have one point of fetching backward incompatible libs.

API added checks for a valid repository on pull command
Added pre-check if repository have a remote_uri defines before pulling
bugfix with no default arguments on api function
added traceback when unhandled exception occurs on API

Fixed methods for checking if path in routes is a repo
added method for checking if path in route is a repos_group

Deprecated UserModel removals

- removed from permissions controller
- removed from settings controller

Extended API

- updated docs
- created two new methods for creating users and creating users groups
- changed user attribute generated from api_key to apiuser for better name compatibility with functoin parameters

Rewrote git middleware with the same pattern as recent fix for #176
- additionally fixed dulwich server bug, that used old deprecated method. This fix caused huge improvement of speed for fetching git repos
- moved simplehg and simplegit middleware into begining of pylons callstack. This low level middleware
don't need to run any of the middlewares except each other.

#176 LookupError: 00changelog.i@66f0739d7517: no node
- fixed mercurial concurency bug. While there were many concurrent request to different repos at one time, sometimes there were race conditions that caused mercurial backend to mix up repository instance with current repo path from environ, a major rewrite of the middleware fixed that.

fixes safe_str method
- trye directly to encode with given encoding instead of trying to make a string out of the unicode

extended safe_str and safe_unicode with chardet fallback.
- if chardet is installed and utf-8 decoding fails we'll fallback to detect encoding

API fixes
- fixed error messages for API