Student bundle

Couldn't do the find/display routes because it needs a big refactor to
handle that.
InfoBundle

Made the base entity employ single table inheritance so I could use the
param converter to find any
FolderBundle

Created a FileBase entity that uses single table inheritance to put
files and folders on the same db table.
Trip Bundle, editing improvement!

Added paramconvert to the TripBundle. Also realized I was doing
database editing the wrong way! Removed a lot of useless code.
UserBundle
ExamBundle
Merge pull request #21 from dmhurley/param-converting

Param converting