Add config file

* Add config.yml file
* Update project description
* Add symfony/yaml component
* Add symfony/yaml directory
* Add config.yml file	
* Initialize configFile variable
* Parse config.yml file
* Pass config as constructor argument to Application object
* Read config constructor argument on Application object
* Init environment & version variables from config data
* Set version & environment from variables
* Update ApplicationTest class
* Add config array on test
* Replace var env with environment