Make return, space, backspace detection more robust until key code tr…

…anslation works. Also handle POST requests with no content

Added 'corrected' option to /readLine

Added BSD 3-clause license

More REST documentation

Added /characterTest, /circleTest, /printwheelSample, and /query endp…

…oints to the REST API. Added ParameterString class to handle parsing delimited lists of parameters