Added support for AT90USB Chips

Added/removed features so that the library works with AT90USB chips,
this is more about getting it the basic library to work, needs to be
changed!
Update to Libraries

Update to libraries to handle AltSoftSerial library as a node
Merge pull request #1 from kmelotti/master

Update to Libraries
Preliminary Sub-Addressing Modifications

These changes haven't been debugged yet. Doesn't working with Graffik
right now. Sending direct hex commands does elicit a confirmation
response from the node, but no observable command execution by the node.
Working Sub-Addressing

Sub-addressing parsing now works and is compatible with Graffik. (Thanks
Kevin!)
Merge pull request #3 from mploof/Sub-address_feature

Working Sub-Addressing
Merge pull request #8 from mploof/master

Working Sub-Addressing