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

#244 fixed my account page

- fixed key error after latest code refactoring

#243 add register link to login dropdown
- for anonymous users to be able to reach that page added a short link to floating box

Code cleanup
- extended repository models with scm functions
- moved get_changeset_safe function to lib

Fixing a small error in the repo settings screen

The 'Add another member' option didn't work in 1.2 beta, as the field
was renamed from `perm_new_user_name` to `perm_new_member_name`

removed users_group controller in replace for model methods,
fixed tests