created CommandReceiver class and added it to networkDemo
removed old make commands in makefile
Merge pull request #14 from ayshih/master

Command/CommandPacket/CommandQueue classes
merge from upstream master
command receiver thread adds command packet to a global queue, added sending of packets to test_command
networkDemo can now parse a queue of commands, use test_command to send it some packets
update to networkDemo
Merge pull request #15 from ayshih/master

Assorted improvements to Command* classes
fixes to Albert's comments
removed testing code to test_commands.cpp
Merge pull request #16 from ehsteve/master

networdDemo now accepts proper command packets and acts on a small subset of them