.travis.yml: Manually install mkl

The py2 build using the theano backend breaks unless mkl is installed
manually and an environment variable set.

.travis.yml

@@ -5,6 +5,7 @@ matrix:
     include:
         - python: 2.7
           env: KERAS_BACKEND=theano
+          env: MKL_THREADING_LAYER=GNU
         - python: 2.7
           env: KERAS_BACKEND=tensorflow
         - python: 3.4
@@ -31,6 +32,8 @@ 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 +55,4 @@ script:
   - echo -e "Running tests with the following config:\n$(cat ~/.keras/keras.json)"
     PYTHONPATH=../$PWD:$PYTHONPATH py.test tests/;
 after_success:
-  - coveralls
+  - coveralls