Pressing enter without typing any expressions into the console causes a panic.  Now there is no execution when the string is empty.
0 / N would return Nil due to an overcompensation for division by zero errors. Now 0 / N returns 0 and N / 0 returns Nil.
Worked on #84. Converted the Nil object to primitive functions as opposed to each behavior having its own constant goroutine.
Fixed #75. Integers now work exactly like Nil (and eventually True and False) concerning primitive behaviors.
Forgot to add the '==' behavior back to integers.
Refactored the addition and starting of primitive behaviors