Replace Handle<> with Local in remaining gin/*

gin/try_catch.cc

Index: gin/try_catch.cc
diff --git a/gin/try_catch.cc b/gin/try_catch.cc
index a44e28e9fe53c90675852e87baf29945e075d11c..97e7fe15f832b33af9d5648152c2f4986a0f137b 100644
--- a/gin/try_catch.cc
+++ b/gin/try_catch.cc
@@ -26,17 +26,17 @@ std::string TryCatch::GetStackTrace() {
   }
 
   std::stringstream ss;
-  v8::Handle<v8::Message> message = try_catch_.Message();
+  v8::Local<v8::Message> message = try_catch_.Message();
   ss << V8ToString(message->Get()) << std::endl
      << V8ToString(message->GetSourceLine()) << std::endl;
 
-  v8::Handle<v8::StackTrace> trace = message->GetStackTrace();
+  v8::Local<v8::StackTrace> trace = message->GetStackTrace();
   if (trace.IsEmpty())
     return ss.str();
 
   int len = trace->GetFrameCount();
   for (int i = 0; i < len; ++i) {
-    v8::Handle<v8::StackFrame> frame = trace->GetFrame(i);
+    v8::Local<v8::StackFrame> frame = trace->GetFrame(i);
     ss << V8ToString(frame->GetScriptName()) << ":"
        << frame->GetLineNumber() << ":"
        << frame->GetColumn() << ": "