PEP8 formatting for sandbox files.
PEP8 formatting for script files.
PEP8 formatting for urbanchoice files.
PEP8 formatting for urbansim files. (But not template files.)
PEP8 formatting for utils files.
PEP8 formatting for urbansimd files.
one small type checking error
Merge pull request #4 from synthicity/pep8

Apply PEP8 formatting across repo