doc updates for BDD testing units

doc/devguide/testing/devtool.md

@@ -16,6 +16,12 @@ The following commands work for Unix environments:
 1. `./dev run-unit-tests`     # executes the chef-spec, unit tests and BDD tests
 1. `./dev clear-unit-tests`   # Removes the /tmp/crowbar-dev-test environment
 
-For debugging, the /tmp/crowbar-dev-test/crowbar_framework environment can be used as a rails app.  The server can be run by running:
-* `script/rails s Puma`
+For debugging, the `/tmp/crowbar-dev-test/crowbar_framework` environment can be used as a rails app.  
+
+The crowbar webserver can be run by running:
+* `bundle exec rails s`
+
+You must do this if you want to debug the BDD tests!  Once the server is running on localhost, you can run the BDD tests interactively from erlang (`erl`) in from the code area (not just the test area) using commands like `bdd:test(crowbar).` and `bdd:debug(crowbar, myfeature, mytestid, debug).`  
+
+> Note: only the `crowbar-dev-test` area will have all the tests available because of the barclamp rollup.