I did something...sort of.

-Changed main to loop for additional commands with exit command
"Hello_World"
-Fixed main so that the tokenizer gets the entire line rather than just
the first string.
-Labeled functions by group member based on email from Grace Coffman.
-Changed Parser.exit from "EXIT" to "EXIT;"
-Wrote handler for exit(). (Hardest thing ever.)
-Wrote handler for delete()...sort of. (Since we aren't integrating into
the DB Engine, it's rather difficult to parse the expression as anything
other than a string since all expressions should parse down to a table.)
-Added header guards because I'm OCD/swag like that.
-Changed automatically generated readme file to not suck.
-Overall tidied up stuff.