getCurrent url bug

I just fixed the issue #63, that created a bad HTTP request, with two slashes in the URL instead of one.

Close #63
You can install a HTTP interceptor, but I am not sure how easy that can be done from the test. See [LoopBackAuthRequestInterceptor](https://github.com/strongloop/loopback-sdk-angular/blob/4b047a1506c47f8721c272b59a88d3329d154f05/lib/services.template.ejs#L301-L330) which checks the URL to decide whether an access token should be sent in the request.

However, it seems to me that we are fixing a problem that is not really a problem, since express can correctly handle paths containing `//`.