Add python 3 build support. (#314)

docs/release/build.sh

@@ -15,6 +15,12 @@ if [ "$1" != "" ]; then
         export PYTHON_FLAGS="-DPYTHON_EXECUTABLE:FILEPATH=/opt/python/cp27-cp27mu/bin/python
                              -DPYTHON_INCLUDE_DIR:PATH=/opt/python/cp27-cp27mu/include/python2.7
                              -DPYTHON_LIBRARIES:FILEPATH=/opt/_internal/cpython-2.7.11-ucs4/lib/libpython2.7.so"
+    elif [ "$1" == "cp35-cp35m" ]; then
+        export LD_LIBRARY_PATH=/opt/_internal/cpython-3.5.1/lib:${LD_LIBRARY_PATH#/opt/_internal/cpython-3.5.1/lib:}
+        export PATH=/opt/python/cp35-cp35m/bin/:${PATH}
+        export PYTHON_FLAGS="-DPYTHON_EXECUTABLE:FILEPATH=/opt/python/cp35-cp35m/bin/python
+                             -DPYTHON_INCLUDE_DIR:PATH=/opt/python/cp35-cp35m/include/python3.5m
+                             -DPYTHON_LIBRARIES:FILEPATH=/opt/_internal/cpython-3.5.1/lib/libpython3.so"
     fi
 fi