Merge pull request #1 from csah632/master

csah632:master
Update hw2.c

Edited date_ok function
Update tdlist.h
Addition of print_list function
Updated print_list function with toggle (stage 3) and P/L commands completed
Addition of 'current' node to keep track of current iteam
Update tdlist.h
Fixed compiler errors for print_list function
Merge remote branch 'origin/master'
move forward and back from current item
Merge pull request #1 from howie8/master

Merge