Integrated WaniKani API

I refactored all .js files so I don't need to create a new instance of each class. I also added the WaniKani.com API which will just load a user's kanji. Since I am only level 1 on WaniKani (timed lessons) I am not entirely sure if this is the most useful implementation for users. 

At this point the app has enough moving parts that I am going to refactor using CoffeeScript/SASS.