fs: undeprecate exists() and existsSync()

fs.exists() and fs.existsSync() were deprecated in #103. This
commit removes the deprecation message, in order to stay more
in sync with joyent/node for the io.js 1.0.0 release.

Fixes: #257
PR-URL: #307
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Bert Belder <bertbelder@gmail.com>

lib/fs.js

@@ -217,25 +217,25 @@ fs.accessSync = function(path, mode) {
   binding.access(pathModule._makeLong(path), mode);
 };
 
-fs.exists = util.deprecate(function(path, callback) {
+fs.exists = function(path, callback) {
   if (!nullCheck(path, cb)) return;
   var req = new FSReqWrap();
   req.oncomplete = cb;
   binding.stat(pathModule._makeLong(path), req);
   function cb(err, stats) {
     if (callback) callback(err ? false : true);
   }
-}, 'fs.exists() is deprecated. Use fs.access() instead.');
+};
 
-fs.existsSync = util.deprecate(function(path) {
+fs.existsSync = function(path) {
   try {
     nullCheck(path);
     binding.stat(pathModule._makeLong(path));
     return true;
   } catch (e) {
     return false;
   }
-}, 'fs.existsSync() is deprecated. Use fs.accessSync() instead.');
+};
 
 fs.readFile = function(path, options, callback_) {
   var callback = maybeCallback(arguments[arguments.length - 1]);