Fix route regex so that it can match when there is a trailing slash.
Upgrade rspec-fire.
Update cane.
Make nokogiri a dev depenendency and force it to 1.5.

1.6 won't install on jruby and 1.8.7. We only use it for the
doc app, anyway, so no need to make it a hard dependency.
Merge pull request #28 from seomoz/handle_trailing_slash

Fix route regex so that it can match when there is a trailing slash.