Normalization character case in many files

Method names and class names must be in strict compliance ( **case sensitive** ). 

This is part of the migration to the Kohana 3.3 ( *see #112, #122 * ).
For more information, see the documentation for the [PSR standard [0,1,2]](https://github.com/php-fig/fig-standards/tree/master/accepted)


See diff