Use Redirector service instead of setting window.location

That makes the routes work under FastBoot.

Author: kzys

app/routes/crate/docs.js

@@ -9,7 +9,7 @@ export default Route.extend({
 
     let documentation = crate.get('documentation');
     if (documentation) {
-      window.location = documentation;
+      this.redirector.redirectTo(documentation);
     } else {
       // Redirect to the crate's main page and show a flash error if
       // no documentation is found

app/routes/crate/repo.js

@@ -3,13 +3,14 @@ import { inject as service } from '@ember/service';
 
 export default Route.extend({
   flashMessages: service(),
+  redirector: service(),
 
   redirect() {
     let crate = this.modelFor('crate');
 
     let repository = crate.get('repository');
     if (repository) {
-      window.location = repository;
+      this.redirector.redirectTo(repository);
     } else {
       // Redirect to the crate's main page and show a flash error if
       // no repository is found