npm: upgrade to 1.4.6npm-1.4.6

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+# util-extend
+
+The Node object extending function that Node uses for Node!
+
+## Usage
+
+```js
+var extend = require('util-extend');
+function functionThatTakesOptions(options) {
+  var options = extend(defaults, options);
+  // now any unset options are set to the defaults.
+}
+```