Restructure server-side directory structure and add app routes

This pull request contains the following changes:

- restructure server-side directory structure
- add basic templates in /views
- add basic routes
- add model.js and controller.js to define easyauth app logic

@krulwich, @suprbh, @ceg1236 - please review.  After this pull request is merged, I'll implement read and write methods to interact with our MongoDB.