Try removing PyCall in build

Author: charleskawczynski

.travis.yml

@@ -31,8 +31,6 @@ before_script:
       brew update
       brew upgrade cmake
     fi
-  - pip install --user -U numpy scipy scikit-learn
-  - julia -e 'using Pkg; Pkg.build("PyCall"); Pkg.update()'
 
 after_success:
   # push coverage results to Codecov