Merge branch 'master' into kai-branch
Merge branch 'master' into kai-branch
modification: ratio constraint

in add_ratio_constraint()
store m_id inside the model object instead of returning it
this allow the information to be pickled

added remove_ratio_costraint() function
bug fix:
add_ratio_constraint()
remove_ratio_constraint()
Revert 8ef181e..8a68186

This rolls back to commit 8ef181e17b6db979f6afc644f31594df0af84cee.
created the "hack" package.

added ratio_constraint.py to hack package.

implemented:
add_ratio_constraint()
remove_ratio_constraint()
list_pseudo_metabolites()
bug fix: remove_ratio_constraint()
Removed wrong init file in src directory.
Merge branch 'master' into kai-branch
added flux_envelope_3d()
- calculate the flux envelope for a triplet of reactions
Merge branch 'kai-branch'
Merge branch 'marta-branch' of github.com:cdanielmachado/framed
Merge pull request #10 from cdanielmachado/marta-branch

Merging pull request from Marta to master branch
Merge branch 'master' of github.com:cdanielmachado/framed
Fixed a couple of problems in GlpkSolver
Tried to fix a couple of things in GlpkSolver
fixed glpk row bounds + status mapping

if row lb == ub: the bound is fixed, otherwise it is a double bound;
the glpk status mapping is now completed and both statuses INFEASIBLE
and NOFEASIBLE are mapped into INFEASIBLE
reset objective function after solving the problem
fixed loop that goes through all the objective function coefs
presolve is back