Issue #373 - fetchAndRenderIssues now constructs the model url.

With an option to pass it the entire thing, rather than composing
from model path and params properties. This is used when following
Link header URIs.

webcompat/static/js/lib/issue-list.js

@@ -291,9 +291,13 @@ issueList.IssueView = Backbone.View.extend({
       this.fetchAndRenderIssues();
     }
   },
-  fetchAndRenderIssues: function() {
-    //assumes this.issues.url has already been set to something meaninful.
+  fetchAndRenderIssues: function(options) {
     var headers = {headers: {'Accept': 'application/json'}};
+    if (options && options.url) {
+      this.issues.url = options.url;
+    } else {
+      this.issues.url = this.issues.path + '?' + $.param(this.issues.params);
+    }
     this.issues.fetch(headers).success(_.bind(function() {
       this.render(this.issues);
       this.initPaginationLinks(this.issues);