Update package.json

Changed serialport dependency to allow latest 1.1.x version
Update package.json

Added node 0.10.x to list of engnes
New conversion from hex string to byte array, plus better description comments
Merge remote-tracking branch 'upstream/master'

Merging in upstream changes to my fork
Merge pull request #13 from freakent/master

New conversion tool from hex string to byte array, plus better descriptions of existing tools