organized js assets

completes #11

app/assets/javascripts/forms/textarea-limit.js

@@ -0,0 +1,25 @@
+$.fn.extend({
+  characterLimiter: function(limit, label) {
+    this.on("keyup focus show", function() {
+      setCount(this, label);
+    });
+
+    // TODO: append label container after $this, instead of hard HTML
+    function setCount(src, label) {
+      if(src !== undefined) {
+        var chars = src.value.length;
+        if (chars >= limit) {
+          src.value = src.value.substr(0, limit);
+          chars = limit;
+        }
+        label.html(limit - chars);
+      }
+    }
+
+    setCount(this[0], label);
+  }
+});
+
+$(document).ready(function() {
+  $('textarea').characterLimiter(1000, $(".chars span"));
+});