install matplotlib in travis, take 3

Author: raghakot

.travis.yml

@@ -31,14 +31,11 @@ install:
   # Useful for debugging any issues with conda
   - conda info -a
 
-  - conda create -q -n test-environment python=$TRAVIS_PYTHON_VERSION numpy pytest pytest-pep8 pytest-cov
+  - conda create -q -n test-environment python=$TRAVIS_PYTHON_VERSION numpy pytest pytest-pep8 pytest-cov matplotlib
   - source activate test-environment
   - pip install git+git://github.com/Theano/Theano.git
   - pip install keras
 
-  # install matplotlib
-  - apt-get build-dep python-matplotlib
-
   # install PIL for preprocessing tests
   - if [[ "$TRAVIS_PYTHON_VERSION" == "2.7" ]]; then
       conda install pil;