Optimize rapi

Optimize rapi

A lot of changes:
- Don't use eval() anymore, it's evil
- Don't compile Regex' on every request, but once when resources.py is
  imported
- Use string comparison for URIs if possible
- Cleanup function used to parse requests (getController)
- Don't put class names as strings, but rather use classes directly
- Change unit tests accordingly
- Sort result of R_root._get to make unit tests reliable

Reviewed-by: amishchenko