getCurrent url bug

I just fixed the issue #63, that created a bad HTTP request, with two slashes in the URL instead of one.
I am afraid this test passes even with the current master.

```
POST /api/Customers? 200 6.544 ms - 37
POST /api/Customers/login?include=user 200 6.006 ms - 180
GET /api//Customers/5 200 1.857 ms - 37
✔ makes a correct HTTP request on User.getCurrent
```

In principle, the test is designed correctly to test the scenario that is important (getting the current user). I am surprised that the test server handled `/api//Customers/5` without any complaint. How comes that your application cannot handle double `//` in the URL? Can you configure the test-server so that it rejects double `//` too?