Enabled CMAKE_CXX_EXTENSIONS (required by Elemental). Removed CXX98 and CXX0X capability tests from ConfigureCXXSTD.cmake
Enabled CMAKE_CXX_EXTENSIONS (required by Elemental). Removed CXX98 and CXX0X capability tests from ConfigureCXXSTD.cmake

tskisner/pytoast,tskisner/pytoast