Trim references to fireball as we want folks using accelerate or pipelining options.  Fireball is pretty well deprecated at this point, but will still be part of the release.
Since the ec2 parameter is named 'key_name' and 'keypair' is just an alias, use
the primary name of the parameter in the examples.
Simplify file module parameter description.
Make the npm production parameter in the docs list the choices.