COMP: Remove std::__1 namespace that slipped through

Change-Id: Iaf7e3db385bc3c27cc898c264de96554985732b3
Merge branch 'TryExplicitInstantiationTesting' of github.com:BRAINSia/ITK into TryExplicitInstantiationTesting
COMP: fix a few things that snuck past the compiler on OS X

Change-Id: Ic5b12650a12c70ef8f487591eed311e485d7249d