Construct WebSocket url from window.location

Also close the WebSocket when it's no more needed.
Implement startRecording and stopRecording on App.Study

Those methods now actually make the API calls to /studies/:id/recording
Add information about used API endpoints
Remove settings menu item
Use concatenated app.css instead of single CSS files
Add title
User Ember-Data to communicate with API

This commit changes everything: now Ember-Data is used instead of self
baked API accessory.
Add fixtures
Add fixture data for ECG
Sort studies by dateCreated
Add more realism to the fixture ECG data

Shift the ECG data to simulate a variability in the heart rate.
Fix bug where a device wasn't checked when a new study is created

The previously used checkbox wasn't checked when a device for a study
has been selected.
Merge pull request #12 from pangratz/ember-data-ify

Ember-Data-ify all the things

This closes #2 and closes #3