Changes filename of data downloads; adds track and url to Interactions model
interface text change: 'Students' -> 'Track Assignments'
adds editInterventionPointFromCanvas.html
Merge branch 'develop' into feature/miscellaneous
removes editInterventionPointFromCanvas.html to be included in separate pull request
changes data downloads to be streaming
Merge branch 'develop' into feature/streaming_data
Renames Mockfile class to Echo
Merge pull request #94 from penzance/feature/streaming_data

Changes data downloads to be streaming
Merge branch 'feature/miscellaneous' into develop

Conflicts:
	ab_tool/analytics.py
	ab_tool/templates/ab_tool/control_panel.html
Merge branch 'develop' into feature/editing_interventions_from_canvas