FEATURE: Better UX for anonymous users (#25)

Improves the subscription flow for anonymous users by making the routes available, and showing a login button. Clicking login from this page will save a `destination_url` cookie so that when logging in they're redirected back to the subscription page they were at.

test/javascripts/helpers/product-pretender.js.es6

@@ -1,41 +1,41 @@
-export default function(helpers) {
+export default function (helpers) {
   const { response } = helpers;
 
-  this.get("/s/products", () => {
+  this.get("/s", () => {
     const products = [
       {
         id: "prod_23o8I7tU4g56",
         name: "Awesome Product",
         description:
-          "Subscribe to our awesome product. For only $230.10 per month, you can get access. This is a test site. No real credit card transactions."
+          "Subscribe to our awesome product. For only $230.10 per month, you can get access. This is a test site. No real credit card transactions.",
       },
       {
         id: "prod_B23dc9I7tU4eCy",
         name: "Special Product",
         description:
-          "This is another subscription product. You can have more than one. From $12 per month."
-      }
+          "This is another subscription product. You can have more than one. From $12 per month.",
+      },
     ];
 
     return response(products);
   });
 
-  this.get("/s/products/:id", () => {
-    const product = {};
-
-    return response(product);
-  });
-
-  this.get("/s/plans", () => {
+  this.get("/s/:id", () => {
+    const product = {
+      id: "prod_23o8I7tU4g56",
+      name: "Awesome Product",
+      description:
+        "Subscribe to our awesome product. For only $230.10 per month, you can get access. This is a test site. No real credit card transactions.",
+    };
     const plans = [
       {
         id: "plan_GHGHSHS8654G",
         amount: 200,
         currency: "usd",
-        interval: "month"
-      }
+        interval: "month",
+      },
     ];
 
-    return response(plans);
+    return response({ product, plans });
   });
 }