Pulling checksums out of the files, some of them can be reused in other places
Replaced checksum calcuations within UPC files with the utils version
Added some tests for things without tests yet
Added tests for the main index file
Added generic 1D barcode drawing class + tests for it.

I hope to convert the the modules over to this cleaner version
Got EAN13 working, and built it off of the new drawing class
EAN13 tests!
Converted UPC-A over to the new draw1D class
Removed some leftover debug code from testing
converetd upc-e too