Merge pull request #4 from ProjFoo/skipper

added BuildPacket method
cleaned up old code
sixteen bit checksum, not sixteen byte
Merge pull request #7 from ProjFoo/skipper

Skipper
implementing gremlin; still needs delay code
well this is gonna be fun
gremlin fixes
First commit after I broke everything
Think happy path is working, need to test with gremlin function.
NAK sad path mostly working, backing up mostly functional version