removed symbolset, replaced with fontawesome throughout for new buttons; updated old code for new button at bottom of grading to also use the FA style

typography, SASS import, mixins/extends

This is to fix a bug with the Backbone 1.0 upgrade; some views were listening to
reset events that were not longer getting fired

load by doing load separately. In process, upgraded backbone which
necessitated changing getByCid to get and got rid of obsolete
course_settings master object.

studio - adding in info icon to page intro help and making icon classes consistent in all new references

studio - page headers: added in logic to style page actions' height based on title having a subtitle or not

a server error and pull the server error handler into a common function.

support the editing of course handouts via a generic editor until we have implemented the Rich HTML editor completed

update styles fixed; tweaks to white button mixins; add update to top of list; render updates upon save