message: Make compatible with CMake 3.8.1
  This ups the minimum CMake version, and declares th package version in
  the `project(...)` command to be compatible with CMake policy CMP0047.
diff: -cmake_minimum_required(VERSION 2.8.12 FATAL_ERROR)
  +cmake_minimum_required(VERSION 3.1.0 FATAL_ERROR)
  -project(wampcc)
  -
  -# Version number
  set (WAMPCC_VERSION_MAJOR 1)
  set (WAMPCC_VERSION_MINOR 6)
  set (WAMPCC_VERSION "${WAMPCC_VERSION_MAJOR}.${WAMPCC_VERSION_MINOR}")
  +project(wampcc VERSION ${WAMPCC_VERSION})
  +
  +# Version number
  # Include extra cmake modules
  set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake")
  