Remove id attribute from hidden _method form field.

By default hiccup generates an id for every form field. In our case
(more than one form with method DELETE on the same page) this leads to
non unique ids which leads to w3c validation errors.

Relates to #130.
Workaround for weavejester/hiccup#109.

src/statuses/views/form.clj

@@ -0,0 +1,19 @@
+(ns statuses.views.form
+  (:require [hiccup.def :refer [defelem]]
+            [hiccup.util :refer [to-uri]]))
+
+(defelem form-to
+  "Create a form that points to a particular method and route.
+  e.g. (form-to [:put \"/post\"]
+         ...)"
+  [[method action] & body]
+  (let [method-str (.toUpperCase (name method))
+        action-uri (to-uri action)]
+    (-> (if (contains? #{:get :post} method)
+          [:form {:method method-str, :action action-uri}]
+          [:form {:method "POST", :action action-uri}
+            [:input {:type "hidden"
+                     :name "_method"
+                     :value method-str}]])
+        (concat body)
+        (vec))))

src/statuses/views/main.clj

@@ -2,11 +2,12 @@
   (:require [clj-time.local :refer [format-local-time]]
             [hiccup.core :refer [html]]
             [hiccup.element :refer [link-to]]
-            [hiccup.form :refer [form-to hidden-field text-field]]
+            [hiccup.form :refer [hidden-field text-field]]
             [statuses.configuration :refer [config]]
             [statuses.routes :refer [avatar-path update-path
                                      updates-path profile-path]]
             [statuses.views.common :as common :refer [icon]]
+            [statuses.views.form :refer [form-to]]
             [statuses.views.layout :as layout]))
 
 (defn- button