Deploy to personal Heroku instance on successful travis.
Upgrade debugger gem
Change encrypted Heroku API key in .travis.yml

We'll need to change this to the Growstuff account's key, I imagine.
Deploy via the Git strategy

This is a shot in the dark: currently deployment is failing with the
error message

/home/travis/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/uri/common.rb:176:in
`split': bad URI(is not URI?):
https://:dcf9d027c49ed30856f71f4232c978d3e1d0e924\n@cisaurus.heroku.com/v1/apps/enigmatic-cove-2527/release
(URI::InvalidURIError)
Changing my Heroku API key

... since I just revealed my old one in my last commit message.  D'oh!