This worked in Xcode 6. Xcode used to replace spaces with %20 and work. I've tried with spaces, backslash before spaces, quoting the string, and double quoting the string. Xcode won't even try to hit the server, probably some parsing error. Using %20 appears to crash Xcode. In fact, I had to delete my old repo in the list from an earlier version of Xcode to even see the list in Xcode 7 beta.
