Possibility targeting https for testing

By supplying the addition of a 3 argument `https` you can now get the tests to run over https rather than the fixed http.

Currently when you `go get` and have `http.ssl=true`, it's not possible to test via `revel test` without making manual alterations. The following change to the command allows you to supply an extra argument so you can tell it which transport mode to use `http|https`.