update display.c keybindings
add functional io. cleanup needed.
add precondition checking to display.c
add argument precondition checking
update README.md
add ability to flag mines
remove unused libraries
add compiler color output (added in gcc 4.9)
new keybindings
Add argument parsing.

Might need to update the makefile in order to link any of the new library headers.
Update README.md
Update README.md
update arg parsing
add missing include for assert.h
update makefile
update main.c
remove debug std output
whitespace change