Fixes #21 - Handle pygrowup errors other than InvalidMeasurement
Separated out 'active' vs 'cancelled'
By changing the status to cancelled we were masking interesting information about whether analysis had succeeded or not.
Fixes #20 - Documentation for report statuses
Merge remote-tracking branch 'origin/master' into refine-views

Conflicts:
	nutrition/models.py
Add 'active' column
Add "Clear Filters" button