Add pyyaml as a requirement

In getting the [web demo](http://caffe.berkeleyvision.org/gathered/examples/web_demo.html) started I get an `ImportError: No module named yaml` error when running `./scripts/download_model_binary.py models/bvlc_reference_caffenet`.
chengyangfu · Oct 13, 2015 · a8839db · a8839db
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commit a8839db
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diff --git a/examples/web_demo/requirements.txt b/examples/web_demo/requirements.txt
@@ -4,3 +4,4 @@ tornado
 numpy
 pandas
 pillow
+pyyaml