Backcompat parsing conflicts

[aaronpk]

I recently added mf1 markup to my review posts in order to appear as Google Rich Snippets. This has had the unfortunate side effect of confusing the crap out of mf2 parsers. Right now, the python parser is the only one that gets it right.

• Original post: https://aaronparecki.com/2016/12/15/16/dropvox
• node parsed
• python parsed

Note there are 5 empty objects before the real h-review. Additionally the p-item property ended up confused. It should be an h-product, but instead is a weird mix of h-item (where did that come from) and the h-product appears as the url property.