DELETE UNECESSARY FILES AND ADD AN ABSTRACT CLASS FOR TRANSPORT
ABSTRACTION

The source files deleted were used only for testing some random functionality,
so their deletition does not have any impact on the project as whole.

The TransportLayer.h file included, though, defines a pure abstract class
for implementing a more general transport layer, as suggested by Thijse
(the current author of CmdMessenger). This way, differents transport
layers may be attached to my library (as bluetooth, ethernet etc) or
even different tools for the same transport layer can be used, as an
example, for serial communication one might use QT, boost::Asio or The
Serial project by William Woodall.