This file is going to be the public api for application,
it will choose where to choose content from.

It's a singleton, and responsible from creating necessary
repositories (e.g tumblr, medium)
Tumblr Integration is being improved. Even though, tumblr api
doesn't let us to get all of the posts from API, TumblrRepository
now has a wrapper function to get all posts of a user.
Minor changes for angular, today has been all about PHP