Adding cython v0.20.2 in third-party.

third_party/cython/src/Makefile

Index: third_party/cython/src/Makefile
diff --git a/third_party/cython/src/Makefile b/third_party/cython/src/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..5b28eae8b0806fa0da7d0181f162d567348bf667
--- /dev/null
+++ b/third_party/cython/src/Makefile
@@ -0,0 +1,41 @@
+PYTHON?=python
+REPO = git://github.com/cython/cython.git
+
+all:    local 
+
+local:
+	${PYTHON} setup.py build_ext --inplace
+
+TMPDIR = .repo_tmp
+.git: .gitrev
+	rm -rf $(TMPDIR)
+	git clone -n $(REPO) $(TMPDIR)
+	cd $(TMPDIR) && git reset -q "$(shell cat .gitrev)"
+	mv $(TMPDIR)/.git .
+	rm -rf $(TMPDIR)
+	git ls-files -d | xargs git checkout --
+
+repo: .git
+
+
+clean:
+	@echo Cleaning Source
+	@rm -fr build
+	@rm -f *.py[co] */*.py[co] */*/*.py[co] */*/*/*.py[co]
+	@rm -f *.so */*.so */*/*.so 
+	@rm -f *.pyd */*.pyd */*/*.pyd 
+	@rm -f *~ */*~ */*/*~
+	@rm -f core */core
+	@rm -f Cython/Compiler/*.c
+	@rm -f Cython/Plex/*.c
+	@rm -f Cython/Runtime/refnanny.c
+	@(cd Demos; $(MAKE) clean)
+
+testclean:
+	rm -fr BUILD
+
+test:	testclean
+	${PYTHON} runtests.py -vv
+
+s5:
+	$(MAKE) -C Doc/s5 slides