If you get a usage printout when you are trying to run 'rails s' (13 feb 13)
When you try to run 'rails s', if you get
Usage: rails new APP_PATH [options] etc.
instead of seeing that the app is running, try this:
bundle exec rails new .
and answer most of the questions 'NO'. Otherwise, it will overwrite your files.
bundle exec rails s
Thanks again, stackoverflow.com.