adjusted travis configuration (without netcdflib)

- removed netCDF4 and dependencies from travis configuration
- fix scipy.io import problem relating to libgfortran Travis CI problem
  described in Issue MDAnalysis/GridDataFormats#17.

.travis.yml

@@ -18,8 +18,6 @@ addons:
     packages:
       - gfortran
       - libgfortran3
-      - libhdf5-serial-dev
-      - libnetcdf-dev
       - liblapack-dev
       - libatlas-dev
 before_install:
@@ -32,7 +30,7 @@ install:
   - if [[ $SETUP == 'full' ]]; then conda create --yes -q -n pyenv python=2.7 numpy=1.9.2 scipy=0.16.0 nose=1.3.7 sphinx=1.3; fi
   - if [[ $SETUP == 'minimal' ]]; then conda create --yes -q -n pyenv python=2.7 numpy=1.9.2 nose=1.3.7 sphinx=1.3; fi
   - source activate pyenv
-  - if [[ $SETUP == 'full' ]]; then conda install --yes python=$TRAVIS_PYTHON_VERSION cython biopython matplotlib networkx netcdf4; fi
+  - if [[ $SETUP == 'full' ]]; then conda install --yes python=$TRAVIS_PYTHON_VERSION cython biopython matplotlib networkx; fi
   - if [[ $SETUP == 'minimal' ]]; then conda install --yes python=$TRAVIS_PYTHON_VERSION biopython networkx; fi
   - if [[ $CYTHONIZE == 'true' ]]; then find . -name '*.pyx' -exec touch '{}' \; ;fi
   - pip install -v package/
@@ -56,3 +54,4 @@ after_success:
      test ${TRAVIS_BRANCH} == ${GH_DOC_BRANCH} && \
      test "${TRAVIS_BUILD_NUMBER}.1" == "${TRAVIS_JOB_NUMBER}" && \
      bash ./maintainer/deploy_docs.sh
+