Add scikit-learn for tests.

Author: adam-azarchs

.travis.yml

@@ -14,12 +14,12 @@ addons:
       - cython
       - python-numpy
       - python-pytest
+      - python-sklearn
 
 install:
-  - pip install numpy cython pytest
+  - pip install numpy cython pytest scikit-learn
 script:
   - pwd
-  - ldd $(llvm-config --libdir)/LLVMgold.so
   - python setup.py install
   - cd tsne/tests
   - py.test -s -vv