numeric sorting on SMS report
rename messages report
Merge pull request #432 from dimagi/psi-updates

numeric sorting on SMS report
swap in the StockReport model so that it's used in reports
add stock report API
Merge pull request #435 from dimagi/commtrack-apis

Stock Report model and API
minor cleanup
Merge pull request #436 from dimagi/mwhite

minor cleanup to report infrastructure
Merge pull request #434 from dimagi/cleanup

remove dead code
remove unused library