New Features:
Minus sign after exponent symbol

Bug Fixes:

Other:
New Features:
Outputs input expression to file, along with equal sign
(eg: 2 * 2 = 4)

Bug Fixes:

Other:
New Features:
Creates an output file and writes the results to it.

Bug Fixes:

Other:
New Features:

Bug Fixes:
Other:
Rearranged code, cleaned up comments.
New Features:

Bug Fixes:
Other:
Random cleanup