Abstract bit transmission out of Manchester functions.
Prior to merge commit
Merge branch 'davids_branch' of github.com:vlantaca/ATxmega128a4u-TWI into davids_branch
I'm lost
Sends 0xDEADBEEF 4 bytes at a time with a 25Hz Manchester bit periods and 15kHz high state.
What needs to be added:
    - checksum
    - add adc readings and response