Validation: incorrect processing of MAC designations

[mmaiers-nmdp]

>>> ard.redux_gl("C*05:ARAX", "lg")
'C*05:ARAXg'
>>> ard.redux_gl("C*05:ARAXBUG", "lg")
'C*05:ARAXBUg'
>>> ard.redux_gl("C*05:ARAXBUGSUCKS", "lg")
'C*05:ARAXBUGSUCKSg'

All three cases should return invalid MAC.
Note what the 2nd case did with the "G"

[pbashyal-nmdp]

Currently validation of invalid data is pretty minimal. It's in my TODO to add more validation before we get to 1.0.0 :)
If py-ard currently can't validate, it returns an empty string ''. Raising ValueError will be inconistent to how it's working with other redux failures.

Per Cw, we had decided we wouldn't add support for Working Committee version of the Serology. That's changed ?