Added specific symfony packages requirements
Normalized php files

* Added all file headers and class headers
* Sorted all use statements, grouped by Symfony and Egualias, alph, ascendent
* Used fabot's php-cs-fixer to fix all php code
Allow phpunit >=3.7 as dependency
#25 - Removed unnesary components from the container xml. Removed tests from being part of the coverage
#25 - Improved tests and subscriber definition
Update repository requirements and some CS fixes from #26