Merged all files from upstream
Changed indentation to 4 spaces
Documentation cleanup; bug introduced

Grades are not recorded after registering them to a specific course in
class Menu: courseMenu()
Converted Manager.java from using arrays to ArrayLists
Merge pull request #1 from delta-nry/branch-1(unstable)

Merging "branch-1(unstable)" into "merging"
Merge pull request #2 from delta-nry/merging

Merging "merging" into "master"