Added cython to anaconda doc
Added cython to anaconda doc


Former-commit-id: 3be0ec1cd8c9b89b6167b9cec88cc54f32e5f9da
danielhers/dynet,danielhers/dynet,shuheik/dynet,clab/dynet,shuheik/dynet,clab/cnn,clab/cnn,xunzhang/dynet,shuheik/dynet,shuheik/dynet,danielhers/dynet,shuheik/dynet,chunyang-wen/dynet,chunyang-wen/dynet,clab/dynet,chunyang-wen/dynet,clab/dynet,clab/dynet,clab/dynet,xunzhang/dynet,danielhers/dynet,danielhers/dynet,shuheik/dynet,clab/cnn,xunzhang/dynet,xunzhang/dynet,danielhers/dynet,shuheik/dynet,danielhers/dynet,clab/dynet,chunyang-wen/dynet,clab/dynet