Add Date type to time arguments in fs

All of the functions which take a time argument accept either numbers
(as seconds since the epoch) or a Date.  Add the Date type to arguments
where it was missing.

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>

Author: kevinoid

fs.js

@@ -320,34 +320,34 @@ fs.openSync = function(path, flags, mode) {};
 
 /**
  * @param {string} path
- * @param {number} atime
- * @param {number} mtime
+ * @param {number|Date} atime
+ * @param {number|Date} mtime
  * @param {function(...)=} callback
  * @nosideeffects
  */
 fs.utimes = function(path, atime, mtime, callback) {};
 
 /**
  * @param {string} path
- * @param {number} atime
- * @param {number} mtime
+ * @param {number|Date} atime
+ * @param {number|Date} mtime
  * @nosideeffects
  */
 fs.utimesSync = function(path, atime, mtime) {};
 
 /**
  * @param {*} fd
- * @param {number} atime
- * @param {number} mtime
+ * @param {number|Date} atime
+ * @param {number|Date} mtime
  * @param {function(...)=} callback
  * @nosideeffects
  */
 fs.futimes = function(fd, atime, mtime, callback) {};
 
 /**
  * @param {*} fd
- * @param {number} atime
- * @param {number} mtime
+ * @param {number|Date} atime
+ * @param {number|Date} mtime
  * @nosideeffects
  */
 fs.futimesSync = function(fd, atime, mtime) {};