fix partial send issue by using Begin() method
fix message endianness
update upload command in readme
refactor encoder sending loop
add a python testbench. pyserial was not cooperating
add repeating identity header so for recognition by surface
remove unused debug print
add disclaimer to Nano_encoder testbench
Merge pull request #59 from CMU-Robotics-Club/ihartwig_derping

fixes for RBSerialMessages library and test code