Corrected development date in readme

I didn't make this project in one day, as the previous README.md implied, so I made the development date more generic (e.g. 'February' instead of 'February nth').
Added support for a tie
Merge pull request #7 from dejay/master

Added support for a tie
altered tie mechanism to use a double-nested for loop
thought of a *much* shorter way to detect ties
Merge pull request #8 from dejay/master

Altered tie mechanism to use a double-nested for loop
Support for starting a new game + features/changes

This is a *huge* commit. Here are some of the changes:

1. I added a menubar with actions to either start a new game or to quit.

   The menubar also supports keyboard shortcuts and displays images if your theme supports it.

2. I changed the way GTKTacToe manages activated cells.

   Instead of dealing with sensitivity internally, I think we should just disable cell sensitivity directly with GTK.

3. I changed the program so that everything is "shown" all at once.

The program could be considered "stable," but this code is probably not ready to merge to master yet.
Muted warnings in Makefile so that I can see errors more easily
Support for playing against the computer.

Use `-c` if you dare! YOU'll NEVER WIN! HA HA HA HA! :laughing:. Actually, it doesn't work *quite* right yet. The computer tends to play one last time after a tie has been announced. This branch still needs a bit of work.
More complete "Playler Vs Computer" implementation

This is still not complete. Additionally, the computer does not win every single time like I thought it did. Will be looking into it.
Fixes for the "ai" implementation
Changed engine/Fixed a potential bug in main file

There was some unncessary code that I had previously placed in `engine.c`. There was also some code that I realized wasn't working the way that I had anticipated, so I fixed it.

I added an `if` statement to `gtktactoe.c` that will prevent a potential bug when starting a new game before the current game is finished.
Made engine stronger.

I don't think you can beat the computer anymore, but I can't be sure...
Made the engine even stronger
Checkbox

I added a checkbox to the menu. It allows the user to toggle between the "computer vs. player" and "player vs. player" modes.
Made some functions "public"
added code to make sure that the computer's second turn is never frivolous
Fixed secondTurn bug
Starting to clean up repetitive code.

This commit adds the displayVictor function.
fixed tabbing in gtktactoe.c