Remove color function from flood fill because it is redundant

[leios]

Direct fix for #765

Because the color function is essentially a bounds check before coloring and the bounds check is done upon querying neighbors, it's not necessary to check on color as well.

I have removed the function and the text associated with it.

This might also change code in #752 and #743

[lazyprop]

This adds the unnecessary a.out binary.

[berquist]

I've confirmed that this works and the book output is correct, but the compiled a.out binary needs to be removed.

[leios]

Woops. Removed the binary file. Thanks for the catch!