Mount of another Grape API on a path doesn't work about grape

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@mbleigh this is done, right?

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The mounting works, but the RHS doesn't. So mounting on "/users" has no effect.

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Fixing this looks complicated. Do we have to alter the paths of the mounted API? Here's a spec for this failure:

      it 'mounts on a path' do
        subject.namespace :cool do
          app = Class.new(Grape::API)
          app.get '/awesome' do
            "sauce"
          end
          mount app => '/mounted'
        end
        get "/mounted/cool/awesome"
        last_response.status.should == 200
        last_response.body.should == "sauce"
      end

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I fixed this, finally, in 70a93a7. It's a bit dirty and in case of nested mounts you must mount outside-in. Maybe @mbleigh can come up with a more elegant fix.