Merge pull request #2 from compbrain/master

Fix documentation example code
The alphasign protocol calls for 7 data bits per byte, not the default 8 (See Alpha Sign Communications Protocol, Section 4.4, Protocol version comparison, on page 8)
Changed bytesize=7 to bytesize=serial.SEVENBITS
Merge pull request #3 from Lucretiel/master

Specify seven data bits in the serial interface.

pyserial defaults to 8, but the Alpha protocol calls for 7.
Fixed allocate inserting lowercase hex characters for the size
characters
Merge pull request #6 from Lucretiel/fix-lowercase-hex

Fixed allocate inserting lowercase hex characters for the size
Merge pull request #1 from msparks/master

Update