binToDec and decToBin are now working with floating point binary numbers
Added test for the new function and the new exception added
PEP8
pep8 test added
pep8 test added
Added feature for working with lists, and added its test
== False changed to not
Error due to __repr__ removed
Binary adder, subtractor added
tests for adders, subtracters
test corrected
Now works with lists.
Added multiplexer IC74152, IC74151A ,IC74153
Added tests 

for IC74152, IC74151A ,IC74153,IC74156, IC74155, IC74139 ,IC74138
Added demux ICs 74138 ,74139 ,74155 ,74156
Create IC74156.py
Create IC74138.py
Create IC74139.py
Create IC74151A
Create IC74153.py