ENH: Added runner for value function iteration.
DOC:  Added model/Readme
ENH: Added more logging/writing and reading for analyze run.
BUG: g_p should take grid size from passed argument,
not params dict.
API/BUG: Wasn't seeding correctly before running value_function.

This added a generator to pipe parameters to the iter wrapper.
updated runvf
ENH: Add reader for rigid_output.
BUG: Fixing implementation errors with that last commit.
DOC:  Added doc to burn_in, rebuilt cfminbound.