Added class controller to front end
Merge pull request #39 from roberthorn/master

Added class controller to front end
added email.go to handle everything we have to do with emails. can send emails to students after class creation. added a few comments to the tops of files (just to help figure out what each file is doing without having to scroll down the whole thing all the time)
DO NOT MERGE WIP, committing local changes from working on add student and sending email