Allow specification of stopbits for a chain.
Mighty mini implementation.
MightyMini no longer inherits from pump so that address can be removed from constructor.
Make positional address argument optional. It is only applicable for Harvard pumps.
Forgot to update logging message in MightyMini constructor; address argument default should be int.
Merge pull request #2 from sammacbeth/mighty_mini

Implementation of SSI Mighty mini pump control