Abandon brief underscore.js dependency.

 // Generated by CoffeeScript 1.3.1
 (function() {
+  var __indexOf = [].indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (i in this && this[i] === item) return i; } return -1; };
 
   window.rivets = (function() {
     var attr, bidirectionalBindings, bindableAttributes, bindings, getInputValue, registerBinding, setAttribute, _fn, _i, _len;
@@ -8,7 +9,7 @@
       adapter.subscribe(context, keypath, function(value) {
         return bindings[type](el, value);
       });
-      if (_.include(bidirectionalBindings, type)) {
+      if (__indexOf.call(bidirectionalBindings, type) >= 0) {
         return $(el).bind('change', function() {
           return adapter.publish(context, keypath, getInputValue(this));
         });
@@ -105,7 +106,7 @@
               node = nodeMap[n];
               if (/^data-/.test(node.name)) {
                 type = node.name.replace('data-', '');
-                if (_.include(_.keys(bindings), type)) {
+                if (type in bindings) {
                   path = node.value.split('.');
                   context = path.shift();
                   keypath = path.join('.');

@@ -10,7 +10,7 @@ window.rivets = do ->
     adapter.subscribe context, keypath, (value) ->
       bindings[type] el, value
 
-    if _.include bidirectionalBindings, type
+    if type in bidirectionalBindings
       $(el).bind 'change', ->
         adapter.publish context, keypath, getInputValue(this)
 
@@ -67,7 +67,7 @@ window.rivets = do ->
           if /^data-/.test node.name
             type = node.name.replace 'data-', ''
 
-            if _.include _.keys(bindings), type
+            if type of bindings
               path = node.value.split '.'
               context = path.shift()
               keypath = path.join '.'