FVA ~20% faster by not calculating the min and maxima in an alternating fashion.
Gurobi solver instances can now be pickled.
Some cleanup of unecessary imports.
Merge pull request #1 from cdanielmachado/pickle_solver

Pickling solver instances
Added missing status check in FVA function.
Merge pull request #2 from cdanielmachado/faster_fva

FVA ~20% faster by not calculating the min and maxima in an alternating ...
Merge branch 'master' into daniel-branch