Change formatting of README.md.
Add Code Conventions section to README.md.
Add Glossary section to README.md.
Improve readability of RDAnalog.h.
Add function header comments to RDAnalog.h.
Update contents of header files to relect the
change in the filename of every header file from
the use of the "RobotDev" prefix to the use of
the "RD" prefix.