Does not work with mountable engines

[luxerama]

This guard does currently not work with mountable engines due to the lack of rails s in the engine root. It should detect that its being run in a mountable engine and use test/dummy/script/rails s instead.

[johnbintz]

I'm pretty swamped, and have never done much with mountable engines. It sounds like you have pretty good experience with them, though. Any chance you'd be able to crank out a pull request for this feature?

[westonplatter]

I actually got this to work inside my mountable engine (use the RubyGems version that is out there as on now). You might want to give it a try.