added method init to engine, that is invoked when the gamerunner starts
TEST test refactor to use DummyEngine
autodiscover new engines
testing http api with supertest
handler.js refactor to avoid req,res dependency
using config.js file to store configuration
using separated stores to save/read players and games
moved source code to src/ folder
added Grunt as task manager
TEST test handler methods
added jshint to detect syntax errors