Add enrollment chart
Fix schoolid reference

Parameter was 'school_id'; should have been 'schoolid'.
Merge branch 'gavin/charts'

Merging branch.
Ignore dump.rdb file
Add dropout percentage chart
Merge branch 'gavin/charts'

Merge charts into master.
Merge branch 'master' of https://github.com/jam-tmrw/teachers

Merge in remote master.