Clarify bad Washington filenames

Add comment specifying that the CSVs are missing and the Excel
files are hard to deal with.  Order files by election, in
ascending order, for easier future review.

Addresses https://github.com/openelections/core/issues/149
Don't create mappings for counties that don't have results

Don't create mappings for counties that didn't produce results
in the 2009 Washington Primary election.

Addresses https://github.com/openelections/core/issues/212
test