Improve service directroy structure

[mamadi]

Organize controllers, routers, etc.

[mamadi]

• http://www.codekitchen.ca/guide-to-structuring-and-building-a-restful-api-using-express-4/
• https://gist.github.com/agendor/9922151
• https://www.airpair.com/javascript/complete-expressjs-nodejs-mongodb-crud-skeleton
• http://bigspaceship.github.io/blog/2014/05/14/how-to-create-a-rest-api-with-node-dot-js/
• http://thejackalofjavascript.com/architecting-a-restful-node-js-app/
• http://scottksmith.com/blog/2014/05/02/building-restful-apis-with-node/
• http://www.sitepoint.com/creating-restful-apis-express-4/
• http://adrianmejia.com/blog/2014/10/01/creating-a-restful-api-tutorial-with-nodejs-and-mongodb/