Add ruby version and gemset flags; bump ruby version
Ignore database.yml for local purposes

* Provide example database.yml so that outside developers have a starting point, but not everyone will have the same setup
* Talk about database.yml in the README
Clean up README.md, merge getting_started.md
Remove comments from db seeds file
Remove commented-out lines and reorder routes
Remove unused voice transcriptions controller
Remove unused text feedback controller
Remove unused questions controller
Remove unused app content sets controller
Remove unused parts of feedback inputs controller
Remove unused parts of subjects controller
Remove unused views
Remove unused mailers