harvey.js: update

harvey.js.md

@@ -1,20 +1,27 @@
 ---
 title: Harvey.js
 category: JavaScript libraries
+layout: 2017/sheet
+intro: |
+  [Harvey.js](http://harvesthq.github.io/harvey/) helps you build responsive interfaces.
 ---
 
 ### Usage
 
-    Harvey.attach('(min-width: 600px)', {
-      setup: function () {
-      },
-      on: function () {
-      },
-      off: function () {
-      }
-    })
+```js
+Harvey.attach('(min-width: 600px)', {
+  setup: function () {
+    // Called on first enter
+  },
+  on: function () {
+    // Called on every enter
+  },
+  off: function () {
+    // Called on every exit
+  }
+})
+```
 
 ### References
 
- * http://harvesthq.github.io/harvey/harvey.js
-
+* <http://harvesthq.github.io/harvey>