"Remote" Debug a running rails server

[existentialmutt]

At work today, it would have been super handy to be able to hook up Light Table to a running rails server and use it to eval statements against the debugger mid-request.

ruby-debug has a drb mode that people have used when using pow or IDE's there's also pry-remote, but that would probably need to be baked into the app.

Related to integrating a rails server in #9

See e.g. https://github.com/kossnocorp/pow-debug http://m.onkey.org/using-ruby-debug-with-pow