fix cglpk bug in parameter handling
fix cglpk bug in parameter handling

Pointed out in this discussion thread:
https://groups.google.com/forum/#!topic/cobra-pie/O7VoALHY4UE

aebrahim/cobrapy,JuBra/cobrapy,jerkos/cobrapy,jerkos/cobrapy,zakandrewking/cobrapy,jeicher/cobrapy,aebrahim/cobrapy,zakandrewking/cobrapy,JuBra/cobrapy,jeicher/cobrapy