Fix dashboard hanging when loading app from contributor URL

Loading the app from /dashboard/contributors/:id is failing, because the
contributors are loaded later. This fetches the requested contributor
separately when launching the app from a contributor profile URL.

app/services/kredits.js

@@ -274,6 +274,12 @@ export default Service.extend({
       });
   },
 
+  async fetchContributor (id) {
+    console.debug(`[kredits] Fetching contributor from the network`);
+    return this.kredits.Contributor.getById(id)
+      .then(data => this.loadContributorFromData(data))
+  },
+
   fetchContributors () {
     console.debug(`[kredits] Fetching all contributors from the network`);
     return this.kredits.Contributor.all()