Add Sam and Livien to README
Merge pull request #88 from lyzidiamond/readme-update

Add Sam and Livien to README
Rescue from IOError's
Create a new twilio client instance per sidekiq job

According to a GH issue*, the twilio-ruby lib is not threadsafe.
Sharing the client instance between threads was causing exceptions
which would happen after the http request to twilio, during the
process of parsing the response from twilio. The exception caused
sidekiq to retry sms jobs, causing duplicates.

* https://github.com/twilio/twilio-ruby/issues/39
Remove debugging code from sms channel
Freeze constant strings
Merge branch 'master' of github.com:codeforamerica/citygram
Populate radius and address for frequency estimate