remove including boost range

Author: huangminghuang

src/mfast/aggregate_ref.h

@@ -10,7 +10,6 @@
 #include "type_category.h"
 
 #include <boost/iterator/iterator_facade.hpp>
-#include <boost/range.hpp>
 
 namespace mfast {
 class unbouned_templateref_error : public virtual boost::exception,

src/mfast/sequence_ref.h

@@ -12,7 +12,6 @@
 
 #include <cassert>
 #include <boost/iterator/iterator_facade.hpp>
-#include <boost/range.hpp>
 
 namespace mfast {
 class sequence_element_cref : public aggregate_cref {