Remove survey solicitation from thanks message, closes #195
Merge pull request #196 from codeforamerica/remove-v3-survey-solicitation

Remove survey solicitation from thanks message, closes #195
Add balance_message method to MessageGenerator, accepting EBT and cash balances
Implement #balance_message for Spanish
Use MessageGenerator#balance_message for AK, CA, OK, PA, TX, and VA
Add tests for NC, OK, PA, VA and make PA not found response more flexible