Minor changes to tcp_client.py

I'm experimenting with splitting ints into bytes and putting them in a
bytearray. This is so I can use the socket library.
Updated gamepad and robot scripts

First actual commit of the gamepad script. Got the basic functions and
packet sending working.  Robot script is receiving packets and breaking
them into the values for the motors and servos. Still haven't tested on
the Pi yet. For now, I'm using localhost loopback