Add SparklineSet.addTotalSparkline() method; use on api_key_item_create.js
Merge branch 'master' of github.com:total-impact/impactstory-analytics

Conflicts:
	impactstoryanalytics/static/js_widgets/api_key_item_creates.js
	impactstoryanalytics/views.py
Fix SparklineSet.addTotalSparkline() so that it goes in a summarySparkline list, prints at bottom.

Also add total sparkline to both widgets on the api dashboard.