v1.9.1

1. Fix bug in the find_noncopyable_vars method which wrongly returned
   member variables of pointer type (#84)

2. Fix bug in the smart_pointer_traits.value_type and
   auto_pointer_traits.value_type methods which didn't find the expected
   value_type declaration (#85)

3. Fix bug in the smart_pointer_traits.is_smart_pointer and
   auto_pointer_traits.is_smart_pointer methods which didn't properly
   work (#85)