rails upgrade gem changes

Hey @all, would like your help looking at the gems that would change if we bump our rails version from 4.0.0 to 4.0.3. Do you know of any gems that are version dependent?

This is a bugfix/security upgrade for rails so there shouldn't be any actual incompatibilities. From my own testing I only found one gem that I had to pin and a new deprecation warning or two.

The only other gem that had a major version upgrade is capistrano. Do we even use it? Should I take it out? It's only installed in development anyway.