added regression test for is_function

[SVN r9644]

status/regression.cfg

@@ -47,6 +47,7 @@ run libs/type_traits/tests/alignment_test.cpp
 run libs/type_traits/tests/arithmetic_traits_test.cpp
 run libs/type_traits/tests/composite_traits_test.cpp
 run libs/type_traits/tests/cv_traits_test.cpp
+run libs/type_traits/tests/function_traits.cpp
 run libs/type_traits/tests/is_convertible_test.cpp
 run libs/type_traits/tests/is_same_test.cpp
 run libs/type_traits/tests/object_type_traits_test.cpp
@@ -67,3 +68,4 @@ run libs/utility/operators_test.cpp
 run libs/utility/tie_example.cpp
 
 
+