migrations mostly
starting mc stuff
getting exercise going
started backbone / api stuff
more bb work
before switching to layout for exercise
composition view working
content markup, parts, etc
representers, some older bb work I've forgotten
some cleanup
more cleanup of api, can edit backgrounds in parts now
adding mathjax and better content editor
writemaths
more writemaths cleanup
got add blank part working
no need for these acc_nested_attrs_for
minor tweaking to part views, empty content views
tinymce with save button working
got part adding working
initial pass at question formats