add test for #107 with fva on infeasible model
add test for #107 with fva on infeasible model

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