Leaner to_solver_based_model (using Reaction.clone to assimilate cobrapy reactions in SolverBasedModel.__init__)
pfba on par with cobrapy pfba
remove old pfba code (commented)
LazySolution considers only reaction variables now and primal => (primal_fwd - primal_rev) and dual => (dual_fwd - dual_rev)
Auxiliary-variables based representation of reversible reactions now functional
Removed python-glpk installation from .travis.yml
Cleaned up license information
Added specific commits to packages installed from github
phenotypic_phase_plane is using TimeMachine now internally
Merge branch 'Aux_variable_solution' into devel

Conflicts:
	.travis.yml