Travis CI example

To use CTest Extension module with Travis CI use the following template for the .travis.yml file:

language: cpp
addons:
    apt:
        sources:
            - george-edison55-precise-backports # cmake 3.2.3
        packages:
            - cmake
            - cmake-data
env:
  - CTEST_MODEL=Nightly
script:
  - ctest -VV -S ./project_test.cmake -DCTEST_MODEL=$CTEST_MODEL