sync to updated yard gem

Gemfile.lock

@@ -1,6 +1,6 @@
 GIT
   remote: git://github.com/Watson1978/yard.git
-  revision: a297a867516fd134ff593496e24114c46026aff7
+  revision: 83b3ad047702bcd0a8a6f9910e5dd9e8b456a82b
   branch: macruby
   specs:
     yard (0.8.3)

Rakefile

@@ -176,7 +176,7 @@ namespace :doc do
       array.c bignum.c class.c compar.c complex.c dir.c encoding.c enum.c
       enumerator.c env.c error.c eval.c eval_error.c eval_jump.c eval_safe.c
       file.c hash.c io.c kernel.c load.c marshal.c math.c numeric.c object.c
-      pack.c proc.c process.c random.c range.c rational.c re.c
+      pack.c prec.c proc.c process.c random.c range.c rational.c re.c
       signal.c sprintf.c string.c struct.c symbol.c thread.c time.c
       transcode.c ucnv.c util.c variable.c vm.cpp vm_eval.c vm_method.c
       NSArray.m NSDictionary.m NSString.m bridgesupport.cpp gcd.c objc.m sandbox.c
@@ -184,6 +184,6 @@ namespace :doc do
     files = TARGETS.map{ |x| "#{x}" }.join(" ")
 
     FileUtils.rm_rf OUTPUT_DIR
-    sh "cd vm; bundle exec yardoc -o ../#{OUTPUT_DIR} #{files}"
+    sh "cd vm; yardoc -o ../#{OUTPUT_DIR} #{files}"
   end
 end