refactor Phoenix.Router.Path.build_url to take a keyword list as it's third arg #161
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When working on #150 I noticed that, based on the way Phoenix.Router.Path.build_url is written, there would be no way to add an optional port. It takes 3 arguments, and the third is an optional string.
This PR converts that third argument to a keyword list, which makes it possible to to pass port and scheme to
%URI{}
. It'd also make it easy add other URI parameters in the future, like query strings.