Merge pull request #2 from mrngoitall/master

Upgraded to Bootstrap 3
Moved DB host connection string to environment variable to enable authentication.
Moved database connection string to env/all.js.
Added routes for getting all questions/answers.
Added answer model/controller based on existing article model/controller.
Added question model/controller based on existing article model/controller.
Removed CRUD operations from questions/answers models. Enabling REST API to return question/answer by ID.
Updated routes to take in parameter for question/answer ID.
Removed article model/controller