deprecated the assess_objective function and added in a reaction module with assess functions
Merge pull request #35 from danielhyduke/issue_34

Deprecations of assess_objective and introduction of cobra.flux_analysis.reaction.assess*
Merge pull request #2 from opencobra/master

Updates from opencobra:master
Patch that removes the independence of the reversibility and bounds attributes for a Reaction
fixed bugs introduced by changing Reaction.reversibility to a property
reaction display misinterprets reversibility

Instead of explicitly looking for 0 or 1, the arrow is now set by
evaluating if self.reversibility as expected. This makes the reactions
display correctly with the reversibility property