PSR global fix with php-cs-fixer tool

Using [PHP-CS-Fixer](https://github.com/fabpot/PHP-CS-Fixer) tool, ?ive fixed all these standards:

* indentation
* linefeed
* trailing_spaces
* unused_use
* extra_empty_lines
* include
* short_tag
* php_closing_tag
* return
* braces
* phpdoc_params
* controls_spaces
* elseif
* eof_ending

I've excluded blocking ones, like PSR-0 and Visibility.