Correct standard-path configuration setting, and other stuff

In #5, there is a major regression. The `phpcs --config-set installed_paths [...]` do not launch code analysis, but only memorize a configuration.
So, from this PR merge, coke do not work, but do not warn :'(

With this PR, i propose a better way to handle standard-path configuration

I also replaced the library used for code analyzing for a version related to Symfony2  standard used in our projects

And, last but not least, i added a lot of debug message

My bad for the yesterday regression