Maybe use url.URL?

[bcl]

In his review of #150 @supakeen suggested using url.URL for the url handling in APIURL and RawURL instead of fmt.Sprintf.
Initially I thought it was a good idea, but after converting weldr I realize that this would make things awkward. Passing in elements to use with url.JoinPath would be really awkward compared to string constants, and constructing query strings would be messy, requiring you to call a function instead of just slapping it on the end of the route.
The urls used are all internal constants, and the protocol and host are hard-coded to http and localhost so I'm not really sure what the benefit of using url.URL would be.