Install Cython on CI

.travis.yml

@@ -132,9 +132,9 @@ before_install:
       ${AMDAPPSDK}/bin/x86_64/clinfo;
       sudo apt-get install -y libgl1-mesa-dev;
     fi
-  # Install swig for Python wrappers. However, testing CUDA and OpenCL, we
-  # skip the Python wrapper for speed. We're not using anaconda python,
-  # but this is a fast way to get an apparently functional precompiled
+  # Install SWIG and Cython for Python wrappers. However, testing CUDA and
+  # OpenCL, we skip the Python wrapper for speed. We're not using anaconda
+  # python, but this is a fast way to get an apparently functional precompiled
   # build of swig that's more modern than what's in apt.
   - if [[ "$OPENCL" == "false" && "$CUDA" == "false" && "$TRAVIS_OS_NAME" == "linux" ]]; then
       wget http://anaconda.org/omnia/swig/3.0.7/download/linux-64/swig-3.0.7-0.tar.bz2;
@@ -142,6 +142,7 @@ before_install:
       tar -xjvf swig-3.0.7-0.tar.bz2 -C $HOME/swig;
       export PATH=$HOME/swig/bin:$PATH;
       export SWIG_LIB=$HOME/swig/share/swig/3.0.7;
+      pip install cython
     fi
   - if [[ "$OPENCL" == "false" && "$CUDA" == "false" && "$TRAVIS_OS_NAME" == "osx" ]]; then
       wget http://anaconda.org/omnia/swig/3.0.7/download/osx-64/swig-3.0.7-0.tar.bz2;

appveyor.yml

@@ -11,6 +11,7 @@ install:
   - "set PATH=C:\\Program Files (x86)\\Git\\bin;%PATH%"
   - pip install pytest
   - pip install numpy
+  - pip install cython
 
 # Use cclash for compiler caching (experimental)
   - ps: wget https://github.com/inorton/cclash/releases/download/0.3.14/cclash-0.3.14.zip -OutFile cclash-0.3.14.zip

devtools/ci/jenkins/install.sh

@@ -26,7 +26,7 @@ create_conda_env() {
 }
 conda remove -yn ${CONDAENV} --all --quiet || true
 create_conda_env || create_conda_env # Crappy way to work around conda concurrency restrictions
-conda install -yn ${CONDAENV} numpy scipy pytest --quiet
+conda install -yn ${CONDAENV} numpy scipy pytest cython --quiet
 source activate ${CONDAENV} # enter our new environment
 
 # Build OpenMM