Added rosscout.launch in libscout
On startup, it will now launch rosscout instead of rosserial. rosscoutincludes rosserial, motors, encoders, and any other helper nodes addedlater.
Fixed problem with serial rx. Rosserial now works.
Tested rosserial a little with a 328.
It doesn't quite work yet. Writing works, reading has not been tested,and rosserial acts weirdly inconsistent.