Add git clone instruction
Add tiny ToC to readme
Fix TOC links
Flush out 3rd party services, modularize deployment pieces, add screenshot for Twilio config
Add Heroku web=2 line and note on price because necessary for call-ins working at any time (dyno can\'t sleep)
Add note on secret token alternative
Add cd after git clone
Improve secret token backup instructions
Add Postgres note to deployment section
Merge pull request #196 from daguar/minor-deployment-instruction-improvements

Minor deployment instruction improvements
Use Python for secret token setting in deployment (installed by default on OSX and Ubuntu)
Merge pull request #199 from daguar/use-python-for-secret-token

Use Python for secret token setting in deployment (installed by default ...
Add 'making_a_survey' doc file with initial content (only, for now) for audio files
Merge pull request #200 from daguar/add-audio-file-overview-to-readme

Add 'making_a_survey' documentation with initial content for audio files