NAN dep upgrade, full node@<=0.11.8 compatibility

package.json

@@ -9,7 +9,7 @@
      "test": "make test"
  }
  , "dependencies": {
-     "nan": "~0.3.0"
+     "nan": "~0.4.1"
  }
  , "devDependencies": {
      "express": "3.0"

src/CanvasPattern.cc

@@ -17,7 +17,7 @@ Persistent<FunctionTemplate> Pattern::constructor;
 
 void
 Pattern::Initialize(Handle<Object> target) {
-  HandleScope scope;
+  NanScope();
 
   // Constructor
   Local<FunctionTemplate> ctor = FunctionTemplate::New(Pattern::New);

src/init.cc

@@ -20,7 +20,7 @@
 
 extern "C" void
 init (Handle<Object> target) {
-  HandleScope scope;
+  NanScope();
   Canvas::Initialize(target);
   Image::Initialize(target);
   ImageData::Initialize(target);