Reorder track#286

Merged

jtigger merged 5 commits intomasterfrom

Feb 20, 2017

Commits on Feb 10, 2017

Commits on Feb 11, 2017

Assign integer difficulties to all ranked exercises
stkent
committed

Commits on Feb 14, 2017

Adjust difficulty rating and position of grade-school
stkent
committed

Commits on Feb 18, 2017

Merge branch 'master' into reorder-track
stkent
committed