Include <array> instead of declare std::array.

Some implementations declare it as std::tr1::array and conflict.

include/boost/fusion/adapted/std_array/tag_of.hpp

@@ -9,15 +9,9 @@
 #define BOOST_FUSION_STD_ARRAY_TAG_OF_01062013_1700
 
 #include <boost/fusion/support/tag_of_fwd.hpp>
-
+#include <array>
 #include <cstddef>
 
-namespace std 
-{ 
-    template<typename T, std::size_t N>
-    struct array;
-}
-
 namespace boost { namespace fusion
 {
     struct std_array_tag;