Switch to bower packages for ember, handlebars and jquery
Remove dependency on Ember.copy
Remove scaffolded application controller
Fix weird spacing
Clean up unused files
Make context getter more robust
Add MicrophoneNode to handle interfacing with mic
Update Ember components.
Set up basic routing for Exercise interface.
Add ConditionalGraph class for dealing with exercise states and transitions.
Kill rendering when ExercisePlayView unloads.

The spectrum analysis is still persisting.  Will deal with that when
appropriate separation of MVC is set up.
Remove section property from ConditionalGraph
Add description property to Exercise model and template
Clean up some unused code
Add default condition that always evaluates to true
Add a method to advance the cursor of the graph to the next node

This can be called pretty much blind whenever a section completes.
Extend graph components.

These don't extend automatically when extending the ConditionalGraph
class for ExerciseGraph.
Set up an exercise graph in the debug exercise.
Remove infinite loop in debug exercise graph.
Cleanup