Fix bug with row names.
Move knapsack model to mp model package.
Print model.
Fix bug with moving columns from general mp model parameters to knapsack model parameters.
Merge pull request #14 from d2rk/knapsack_model

Knapsack model
Update list of maintainers.
Merge pull request #15 from d2rk/update_maintainers_list

Update list of maintainers
Merge remote-tracking branch 'upstream/master'

4/12/13