BUG: require both tr1 type_traits and functional

VS9 with out SP 1 contains tr1 functional but not type traits. The FAQ
URL has also been updated. On VS9 w/o SP1, the cmake error is not
correctly shown.

Change-Id: I4cc3762e1d9140830293a4692f4b3348627cae02
Merge topic 'SIMPLEITK-401_FixTR1CheckingLogic' into next

5f61f0c BUG: require both tr1 type_traits and functional