Added comments.

-Author and date at top of each source file.
-Class explanations
Scroll Right now works.

-In ListDisplay, changed vector< pair<string, ListDisplay *> > to vector< pair<string, int> >. Pointer to list was not really necessary, just index of list to go to next works. Couldn't get the pointer version to work, but with simple int indices, can now scroll right.

-Still need to implement scroll left.