Fixed Travis to work with downgraded GDAL

  - conda info -a

  # Create a virtual env and install dependencies

  - conda create -y -q -n test-env python=$TRAVIS_PYTHON_VERSION nose gdal numpy pillow scipy pandas networkx scikit-image

  - conda create -y -q -n test-env python=$TRAVIS_PYTHON_VERSION nose numpy pillow scipy pandas networkx scikit-image

  # Activate the env

  - source activate test-env

  # Install the non-conda packages if required, requirements.txt duplicates are ignored

  - conda install -c https://conda.anaconda.org/jlaura opencv3=3.0.0

  - conda install -c osgeo proj4

  - conda install -c https://conda.anaconda.org/osgeo gdal

  - conda install -c https://conda.anaconda.org/osgeo proj4

  - pip install -r requirements.txt

  - pip install coverage

  - pip install coveralls