get everything in travis from conda-forge

Author: phobson

.travis.yml

@@ -36,7 +36,7 @@ install:
 
   - conda create --yes -n test python=$TRAVIS_PYTHON_VERSION
   - source activate test
-  - conda install --yes numpy matplotlib coverage docopt requests pyyaml
+  - conda install --yes --channel=conda-forge numpy matplotlib coverage docopt requests pyyaml
   - conda install --yes --channel=conda-forge pytest pytest-cov pytest-mpl
   - if [ ${COVERAGE} = true ]; then conda install scipy --yes; fi
   - pip install coveralls