TextMate, rvm, ActiveSupport outside of Rails, "require"s from current directory, all together now!

I'm prototyping some calendar/date stuff for a Rails app in standalone scripts, and want access to both normal Rails things (in this case, ActiveSupport's date math, like Date.today - 3.days) and my own classes within the prototyping directory. I'd like to continue using TextMate's "Run" command to run the current buffer as a Ruby script, since it's convenient. I'm using rvm; my prototyping