1.9.3-p0 is a bit surprising

**Important:** Which patch level is running on the Servers and for Travis? I'm not sure what would be involved in changing them, and whether or not it would be worthwhile.

* Afaik, RVM was one of the first version managers to adopt @fnichol's suggestion for  `.ruby-version`, so the `.rvmrc` file should not be necessary.
* Heroku is currently running `1.9.3-p327`. All tests pass in this version.
* I had one failure in `api_key_reset.feature` when running the tests in the latest `1.9.3-p385`. Might be specific to my environment.