Add .update_col_from_series method to DataFrameWrapper

Allows updating a subset of a local column by passing in a Series
with the new values.
Merge pull request #77 from synthicity/update-col-from-series

Add .update_col_from_series method to DataFrameWrapper
Adding logging to simulation module.
Merge pull request #78 from synthicity/sim-logging

Adding logging to simulation module
Merge branch 'master' into new-simulation-testing

Conflicts:
	urbansim/sim/simulation.py