Fix Travis script for master branch

Author: vbkaisetsu

.travis.yml

@@ -61,7 +61,10 @@ matrix:
       script:
         - export PRIMITIV_PYTHON_BUILD_NUMBER="${TRAVIS_BUILD_NUMBER}";
         - pip install cython numpy scikit-build twine
-        - $TRAVIS_BUILD_DIR/setup.py sdist --bundle-core-library
+        - wget "http://bitbucket.org/eigen/eigen/get/3.3.4.tar.bz2" -O eigen-downloaded.tar.gz
+        - mkdir ./eigen-downloaded
+        - tar xf ./eigen-downloaded.tar.gz --strip-components=1 -C ./eigen-downloaded
+        - $TRAVIS_BUILD_DIR/setup.py sdist --bundle-core-library --bundle-eigen-headers ./eigen-downloaded
       deploy:
         skip_cleanup: true
         provider: script