Bump fails_with clang

Closes #1355.
zoltan 3.81

New version of Zoltan (3.81).

Closes #1349.
gdcm: add option to build with vtk

Closes #1331.
gdcm: add c++11 option

Closes #1356.
insighttoolkit: add option to build ITK with gdcm

Closes #1332.
Merge remote-tracking branch 'upstream/master'