store serviceURL append final slash

[g-alfieri]

I had an issue for the sendRequest because the custom serviceURL param had no final slash. Debugging was not too very difficult but the problem can easily be solved checking if there is the url final slash.

[Peardian]

Thank you for reporting this bug. I fixed it for the default service URL, but I forgot to fix it for the override as well. Since the bug is relatively minor, I am going to wait and have it fixed as part of the config overhaul (#103).