.travis.yml: Manually install mkl

The py2 build using the theano backend breaks unless mkl is installed
manually.

.travis.yml

@@ -31,6 +31,8 @@ install:
 
   - conda create -q -n test-environment python=$TRAVIS_PYTHON_VERSION numpy scipy matplotlib pandas pytest h5py
   - source activate test-environment
+  # Prevent py2 theano build getting upset
+  - conda install -q -y mkl-service
   - pip install git+git://github.com/Theano/Theano.git
   - pip install keras
 
@@ -52,4 +54,4 @@ script:
   - echo -e "Running tests with the following config:\n$(cat ~/.keras/keras.json)"
     PYTHONPATH=../$PWD:$PYTHONPATH py.test tests/;
 after_success:
-  - coveralls
+  - coveralls