Adding cython v0.20.2 in third-party.

third_party/cython/src/cython.py

Index: third_party/cython/src/cython.py
diff --git a/third_party/cython/src/cython.py b/third_party/cython/src/cython.py
new file mode 100755
index 0000000000000000000000000000000000000000..bcc2d8667ad37190f39010c9ed280d3965a44a2f
--- /dev/null
+++ b/third_party/cython/src/cython.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+
+#
+#   Cython -- Main Program, generic
+#
+
+if __name__ == '__main__':
+
+    import os
+    import sys
+    
+    # Make sure we import the right Cython
+    cythonpath, _ = os.path.split(os.path.realpath(__file__))
+    sys.path.insert(0, cythonpath)
+
+    from Cython.Compiler.Main import main
+    main(command_line = 1)
+
+else:
+    # Void cython.* directives.
+    from Cython.Shadow import *
+    ## and bring in the __version__
+    from Cython import __version__