Added a bit more to peck payload handler test
Added sing payload unit tests
Added mock payload unit test
Fixed bugs encountered when running mock tests

Next expected packet wasn't being set,
Packet was being sent over serial instead of over TCP (sensor sends to
server)
Modularized payload tests

The tests also form a chain, so calling sing, for instance will call
peck and eyeball (with all options)
Improved generic payload tests
Added peacock unit test, fixed problems w/ handler

Added a peacock unit test, tested the handler against the test and
fixed the bugs that showed up after running the test
Added nesting payload unit test