reporting rates report (sans chart)
fix error in reporting rates report for locs with no children
chart on reporting rates report
nvd3 pie chart can compute %s on its own
improve big-o of reporting period lateness algorithm
Merge branch 'master' into commtrack

Conflicts:
	corehq/apps/commtrack/stockreport.py
remove .gitignore in preparation for merge
subtree merged in core-hq (commtrack branch)
Merge branch 'master' into core-hq-commtrack