Removed Class.java file, used the name my course as to
avoid confusion with the actual course(ie class) and
actual java classes.
Added the ability to load XML files.
Added files to .gitignore
lilong commit - sprint1

lilong commit - sprint1
Finished writing code for Assignment, AssignmentCategory, GhostStudent, MyCourse, and Student objects.

conflict resolution
Cleaned up code, commenting. Refined test file.
Merge pull request #7 from spockNinja/fix_jesse

Jesse's changes
Fixing some commit stuff.
Removing unused variables.