Update minimum CMake Version supported

[hjmjohnson]

Environment

cmake

Issue

More modern versions of cmake respect the C++11 language better.

an outdated (but relevant) related discussion is: https://discourse.itk.org/t/minimum-cmake-version-update/585

Context:

An outdated (but relevant) related discussion is: https://discourse.itk.org/t/minimum-cmake-version-update/585

Expectation
Force users to use a more modern C++ 11 compliant version of cmake environment to avoid hidden problems like assuming that CMAKE_CXX_STANDARD=11 has an effect on the cmake environment in cmake version 2.8.

Explicit failure is better than silent failure.