break MVP into separate files
* create model's API functions for manipulating it's state
* create init function as entry point into application
handle correct user input
* breaking on period
simplify callback for keyup
* isCorrect returns a boolean
* keyupCallback is a ternary operator that either runs
this.success or this.failure
* ignore backspacing, input fields, all that bullshit
clean up dom preparation functions & naming
* move prepare-view into view object