Added dynamic programming applications labs to import list.
Added some plots to the value function iteration lab.  Also added plot file and solutions file.
Added a figure to stochastic lab.  Also add plot and solution files.
Added a figure along with figure code and other small edits.
Merge branch 'develop' into dyn_prog

Conflicts:
	Vol2.tex

I had something commented out in my version.  Fixed it.
Added policy iteration solutions.
Merge pull request #220 from jhendr/dyn_prog

Dynamic Programming
Revision of the Cython lab. It is really long now, but the examples should
make it quicker to work through.
Merge pull request #221 from insertinterestingnamehere/cython

Revision of the Cython lab.