Change mojo url to always use mojo:foo instead of mojo://foo

sky/README.md

 Sky
 ===
 
 Sky is an experiment in building a UI framework for Mojo.  The approach we're
 exploring is to create a layered framework based around a retained hierarchy of
 semantic elements.  We're experimenting with different ideas and exploring
 various approaches, many of which won't work and will need to be discarded, but,
 if we're lucky, some of which might turn out to be useful.
 
 Sky has three layers, each of which also adds progressively more opinion.  At
@@ skipping 110 matching lines @@
 ``network_service``.  Typically, however, Sky applications access services via
 frameworks that provide idiomatic interfaces to the underlying Mojo services.
 These idiomatic interfaces are layered on top of the underlying Mojo service,
 and developers are free to use the underlying service directly.
 
 As an example, the following is a sketch of a module that wraps Mojo's
 ``network_service`` in a simpler functional interface:
 
 ```html
 SKY MODULE
-<import src=”mojo://shell” as=”shell” />
+<import src=”mojo:shell” as=”shell” />
 <import src="/mojo/network/network_service.mojom.sky" as="net" />
 <import src="/mojo/network/url_loader.mojom.sky" as="loader" />
 <script>
 module.exports = function fetch(url) {
   return new Promise(function(resolve, reject) {
     var networkService = shell.connectToService(
-        "mojo://network_service", net.NetworkService);
+        "mojo:network_service", net.NetworkService);
     var request = new loader.URLRequest({
         url: url, method: "GET", auto_follow_redirects: true});
     var urlLoader = networkService.createURLLoader();
     urlLoader.start(request).then(function(response) {
       if (response.status_code == 200)
         resolve(response.body);
       else
         reject(response);
     });
   };
@@ skipping 11 matching lines @@
 We're documenting Sky with a [set of technical specifications](specs) that
 define precisely the behavior of the engine.  Currently both the implementation
 and the specification are in flux, but hopefully they'll converge over time.
 
 Contributing
 ------------
 
 Instructions for building and testing Sky are contained in [HACKING.md](HACKING.md). For
 coordination, we use the ``#mojo`` IRC channel on
 [Freenode](https://freenode.net/).