move closure.h down. Closes #80

src/Canvas.cc

@@ -7,12 +7,12 @@
 
 #include "Canvas.h"
 #include "CanvasRenderingContext2d.h"
-#include "closure.h"
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
 #include <node_buffer.h>
 #include <node_version.h>
+#include "closure.h"
 
 Persistent<FunctionTemplate> Canvas::constructor;