Reduce _.compact and revert _.random use in _.shuffle.

Former-commit-id: 17d153cb09c262830f1497f93c0f3d9b279c8f8a

build.js

@@ -138,7 +138,7 @@
     'reject': ['identity'],
     'rest': [],
     'result': ['isFunction'],
-    'shuffle': ['random'],
+    'shuffle': [],
     'size': ['keys'],
     'some': ['identity'],
     'sortBy': ['identity'],

lodash.js

@@ -2396,8 +2396,9 @@
         result = [];
 
     while (++index < length) {
-      if (array[index]) {
-        result.push(array[index]);
+      var value = array[index];
+      if (value) {
+        result.push(value);
       }
     }
     return result;
@@ -2860,7 +2861,7 @@
         result = Array(length);
 
     while (++index < length) {
-      var rand = random(index);
+      var rand = nativeFloor(nativeRandom() * (index + 1));
       result[index] = result[rand];
       result[rand] = array[index];
     }