WIP: Quick post: Add RESTful backend

#143 
Restful API:

``api/blog_posts``

![selection_006](https://cloud.githubusercontent.com/assets/7369740/4789414/f1544d14-5dc4-11e4-9362-b49602828350.png)


@amitaibu PR is ready.
``OG_AUDIENCE_FIELD``