Run parquet-cpp unit tests in Travis CI

Change-Id: I782dbd3b52796161912776e5939e4b469646ee8b

Author: wesm

ci/travis_script_python.sh

@@ -42,10 +42,13 @@ python_version_tests() {
   # Expensive dependencies install from Continuum package repo
   conda install -y pip numpy pandas cython
 
+  # Install only parquet-cpp, without its dependencies
+  conda install -y --no-deps parquet-cpp
+
   # Other stuff pip install
   pip install -r requirements.txt
 
-  python setup.py build_ext --inplace
+  python setup.py build_ext --inplace --with-parquet
 
   python -m pytest -vv -r sxX pyarrow