Adds partial changes to write only key feature.
Adds read and write commands to data slots.
Adds debug around write.
Fixes always succeeding write bug.  Adds mac to write32.
Changes key slots 6 and 7 to required encrypted writes.
Updates signature for new write32.
Adds nonce command.  Resolves issue #17.
Adds copy buffer utilities and xor utility.
adds initial (broken) encrypted write feature.
Defaults bus to /dev/i2c-1

Removes the required positional argument for the bus and defaults to
/dev/i2c-1.  Resolves issue #20.
Adds factory tests
adds board and sch files
Adds attribution to board files
Fixes doc errors and adds section on personalization.  Resolves #26.

Fixes minors typos.
Adds email to GPG key and short fingerprint.
Adds warning to personalization command.
Adds clarifying error message to failed bus for issue #20.
Adds key import feature.  Resolves #15.

Allows the option to clone the data zone from another device if the file
is specified with the -f option.  Currently the configuration zone is
not cloned, just the data zone.
Copies the response byte.  Resolves issue #24.
Always updates the seed.  Resolves issue #30.
Adds check-mac documentation.  Resolves #22.
Bumps version.