Corrections, clarifications to the policy function iteration lab. Updated
the solutions file.
remove NURBS stub.

No longer will there be a NURBS lab.
Merge pull request #534 from ayr0/rm_m

remove NURBS stub.
remove old pagerank matlab code
remove unneeded files

Also rename files to remove the '_C' appendage.
rename some of the labs
remove old matlab code from julia lab
Merge pull request #535 from ayr0/rm_m

Clean up old files and labs (step 2)
Merge pull request #533 from abefrandsen/policy_iteration

Corrections, clarifications to the policy function iteration lab. Update...