Adding logging statements to urbansim.model.
Adding logging in a couple places in urbanchoice.
Convert a print to logging.debug.
Add utilities for controlling urbansim logging.
Merge pull request #41 from synthicity/logging

Add some logging and configuration helpers
move NETWORKS back to Networks from dataset
PEP8 fix.
Update README.md
changed 'alternatives' to 'merged' for the sim_pdf Series index on line 351
Merge pull request #45 from synthicity/eddie

Changed 'alternatives' to 'merged' for the sim_pdf Series index
Update image location
Merge branch 'master' into developer-tests
checking in a few more tests

not quite finished yet but want to check that code coverage is 100%