diff --git a/vendor/docdown/src/DocDown/Alias.php b/vendor/docdown/src/DocDown/Alias.php
index 1f9521e1b..6a873c0af 100644
--- a/vendor/docdown/src/DocDown/Alias.php
+++ b/vendor/docdown/src/DocDown/Alias.php
@@ -26,6 +26,7 @@ class Alias {
     $this->owner = $owner;
     $this->_name = $name;
     $this->_call = $owner->getCall();
+    $this->_category = $owner->getCategory();
     $this->_desc = $owner->getDesc();
     $this->_example = $owner->getExample();
     $this->_lineNumber = $owner->getLineNumber();
@@ -65,6 +66,16 @@ class Alias {
     return $this->_call;
   }
 
+  /**
+   * Extracts the owner entry's `category` data.
+   *
+   * @memberOf Alias
+   * @returns {String} The owner entry's `category` data.
+   */
+  public function getCategory() {
+    return $this->_category;
+  }
+
   /**
    * Extracts the owner entry's description.
    *
diff --git a/vendor/docdown/src/DocDown/Entry.php b/vendor/docdown/src/DocDown/Entry.php
index 887241bf0..c61f9e852 100644
--- a/vendor/docdown/src/DocDown/Entry.php
+++ b/vendor/docdown/src/DocDown/Entry.php
@@ -152,6 +152,25 @@ class Entry {
     return $this->_call;
   }
 
+  /**
+   * Extracts the entry's `category` data.
+   *
+   * @memberOf Entry
+   * @returns {String} The entry's `category` data.
+   */
+  public function getCategory() {
+    if (isset($this->_category)) {
+      return $this->_category;
+    }
+
+    preg_match('#\* *@category\s+([^\n]+)#', $this->entry, $result);
+    if (count($result)) {
+      $result = trim(preg_replace('/(?:^|\n)\s*\* ?/', ' ', $result[1]));
+    }
+    $this->_category = $result;
+    return $result;
+  }
+
   /**
    * Extracts the entry's description.
    *
diff --git a/vendor/docdown/src/DocDown/Generator.php b/vendor/docdown/src/DocDown/Generator.php
index 427330620..e9ca1c27a 100644
--- a/vendor/docdown/src/DocDown/Generator.php
+++ b/vendor/docdown/src/DocDown/Generator.php
@@ -204,6 +204,7 @@ class Generator {
    */
   public function generate() {
     $api = array();
+    $categories = array();
     $compiling = false;
     $openTag = "\n<!-- div -->\n";
     $closeTag = "\n<!-- /div -->\n";
@@ -223,14 +224,26 @@ class Generator {
 
       foreach ($members as $member) {
         // create api category arrays
-        if (!isset($api[$member]) && $member) {
+        if ($member && !isset($api[$member])) {
           // create temporary entry to be replaced later
-          $api[$member] = new Entry('', '', $entry->lang);
+          $api[$member] = new stdClass;
           $api[$member]->static = array();
           $api[$member]->plugin = array();
         }
 
-        // append entry to api category
+        // track categories
+        $category = $entry->getCategory();
+        if ($category) {
+          if (!isset($categories[$category])) {
+            $categories[$category] = array();
+          }
+          $categories[$category][] = $entry;
+          foreach ($entry->getAliases() as $alias) {
+            $categories[$category][] = $alias;
+          }
+        }
+
+        // append entry to api member
         if (!$member || $entry->isCtor() || ($entry->getType() == 'Object' &&
             !preg_match('/[=:]\s*(?:null|undefined)\s*[,;]?$/', $entry->entry))) {
 
@@ -268,19 +281,19 @@ class Generator {
     function sortCompare($a, $b) {
       $score = array( 'a' => 0, 'b' => 0);
       foreach (array( 'a' => $a, 'b' => $b) as $key => $value) {
-        // capitalized keys that represent constructor properties are last
+        // capitalized properties are last
         if (preg_match('/[#.][A-Z]/', $value)) {
           $score[$key] = 0;
         }
-        // lowercase keys with prototype properties are next to last
+        // lowercase prototype properties are next to last
         else if (preg_match('/#[a-z]/', $value)) {
           $score[$key] = 1;
         }
-        // lowercase keys with static properties next to first
+        // lowercase static properties next to first
         else if (preg_match('/\.[a-z]/', $value)) {
           $score[$key] = 2;
         }
-        // lowercase keys with no properties are first
+        // root properties are first
         else if (preg_match('/^[^#.]+$/', $value)) {
           $score[$key] = 3;
         }
diff --git a/vendor/underscore/test/arrays.js b/vendor/underscore/test/arrays.js
index a757ced67..32252a3f5 100644
--- a/vendor/underscore/test/arrays.js
+++ b/vendor/underscore/test/arrays.js
@@ -14,6 +14,8 @@ $(document).ready(function() {
     equal(result.join(','), '1,1', 'works well with _.map');
     result = (function() { return _.take([1,2,3], 2); })();
     equal(result.join(','), '1,2', 'aliased as take');
+
+    equal(_.first(null), undefined, 'handles nulls');
   });
 
   test("rest", function() {
@@ -47,6 +49,8 @@ $(document).ready(function() {
     equal(result, 4, 'works on an arguments object');
     result = _.map([[1,2,3],[1,2,3]], _.last);
     equal(result.join(','), '3,3', 'works well with _.map');
+
+    equal(_.last(null), undefined, 'handles nulls');
   });
 
   test("compact", function() {
@@ -136,6 +140,8 @@ $(document).ready(function() {
 
     var stooges = {moe: 30, larry: 40, curly: 50};
     ok(_.isEqual(_.object(_.pairs(stooges)), stooges), 'an object converted to pairs and back to an object');
+
+    ok(_.isEqual(_.object(null), {}), 'handles nulls');
   });
 
   test("indexOf", function() {
diff --git a/vendor/underscore/test/collections.js b/vendor/underscore/test/collections.js
index efc5723d4..7dce44ba5 100644
--- a/vendor/underscore/test/collections.js
+++ b/vendor/underscore/test/collections.js
@@ -411,6 +411,8 @@ $(document).ready(function() {
     equal(func(1, 2, 3, 4), 4, 'can test the size of the arguments object');
 
     equal(_.size('hello'), 5, 'can compute the size of a string');
+
+    equal(_.size(null), 0, 'handles nulls');
   });
 
 });
diff --git a/vendor/underscore/underscore-min.js b/vendor/underscore/underscore-min.js
index ad3a39ad8..0bdee410c 100644
--- a/vendor/underscore/underscore-min.js
+++ b/vendor/underscore/underscore-min.js
@@ -2,4 +2,4 @@
 //     http://underscorejs.org
 //     (c) 2009-2012 Jeremy Ashkenas, DocumentCloud Inc.
 //     Underscore may be freely distributed under the MIT license.
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diff --git a/vendor/underscore/underscore.js b/vendor/underscore/underscore.js
index 1ebe2671b..43b4e407d 100644
--- a/vendor/underscore/underscore.js
+++ b/vendor/underscore/underscore.js
@@ -369,6 +369,7 @@
 
   // Return the number of elements in an object.
   _.size = function(obj) {
+    if (obj == null) return 0;
     return (obj.length === +obj.length) ? obj.length : _.keys(obj).length;
   };
 
@@ -379,6 +380,7 @@
   // values in the array. Aliased as `head` and `take`. The **guard** check
   // allows it to work with `_.map`.
   _.first = _.head = _.take = function(array, n, guard) {
+    if (array == null) return void 0;
     return (n != null) && !guard ? slice.call(array, 0, n) : array[0];
   };
 
@@ -393,6 +395,7 @@
   // Get the last element of an array. Passing **n** will return the last N
   // values in the array. The **guard** check allows it to work with `_.map`.
   _.last = function(array, n, guard) {
+    if (array == null) return void 0;
     if ((n != null) && !guard) {
       return slice.call(array, Math.max(array.length - n, 0));
     } else {
@@ -491,6 +494,7 @@
   // pairs, or two parallel arrays of the same length -- one of keys, and one of
   // the corresponding values.
   _.object = function(list, values) {
+    if (list == null) return {};
     var result = {};
     for (var i = 0, l = list.length; i < l; i++) {
       if (values) {