Major update

KConfig (updated)
- Simple high-level class to manipulate configurations files
- technical improvments (see diff)

KParser (new)
- Base class to parse configuration files.
- Provide UNIX/INI syntax parser, JSON and XML come soon

KRegistry (deleted)
- Old DOM-tree-like class removed, replaced by KTree

KTree (update)
- Implement more method to control tree and get informations