BUG: Boost Fixes
COMP: boost has compiler errors on os x but it builds.

ANTS now seems willing to go along with USE_SYSTEM_BOOST
COMP: BRAINSTools needs to depend on SimpleITK.

Autoworkup requires SimpleITK, and BRAINSTools needs to depend on it.
Merge pull request #4 from BRAINSia/Boost_Fixes

Boost fixes