Add coverband
First steps toward moving to elasticsearch.
Converted to minitest. Created a few fixtures. Add 2 Person tests.
Cleaned up fixtures
Fixed keys in district and state fixtures.
Added District.tag and a test for round-trip of district tag parsing.
Updated Gemfile to use minitest-spec-rails instead of minitest-rails. Also made it use sentry-raven from rubygems instead of git.
Revert "First steps toward moving to elasticsearch."

This reverts commit 00437e420197a2cfb635e423355114923dfd2828.