Two updates to utils.

1. Added a script to split csv files into multiple files, analagous to bash's split.

2. Updated build.sh to write ../wyr-all-zips-data.txt file
Updated code to no longer rely on the WriteYourRep website.

Also updated code so that we don't need to customize python scripts for every new csv format.  Instead, the structure is read from csv file header.
deleted a file.