removed template model and db tables
removed unit tests that are outside of rspec
added audio_exercise_items
fixed merge issues (attempt1)
deleted column.rb
Before Creating Headers Model
started refactoring header row into its own class
Got griddrill set up correctly
refactored out header_rows and added Header class
removed the last vestiges of the active admin bullshit
shitty commit message
Feature:  add and remove columns in grid view
audio uploader still broken
added some json responders
got most of the tests passing to prepare for adding ember