Display flash errors and notices

public/style.css

@@ -185,6 +185,12 @@ tr
   padding: 10px 25px;
 }
 
+#notice {
+  background-color: green;
+  color: white;
+  padding: 10px 20px;
+}
+
 #error {
   background-color: red;
   color: white;

views/layout.haml

@@ -8,6 +8,12 @@
     <script type="text/javascript">try{Typekit.load();}catch(e){}</script>
   %body
     #main
+      - if flash[:notice]
+        #notice
+          %p= flash[:notice]
+      - if flash[:error]
+        #error
+          %p= flash[:error]
       = yield
     #footer
       #footer_inner