Merge pull request #8 from neggro/master

Server changes: authorization and cars
deleted config file, that was added by a pull request from @neggro
removed bodyParser, now we use only json and urlencoded parsers
cors headers into a separated middleware
moved app.use cors headers middleware
updated README
changed bodyParser to two middlewares, improve
improved the security, using OAUTH2
improved authentication flow, removed some console.log