7b76f3dff9f7b9616ab8179571eb711da9fc3f54
Added some CFURL functions and constants I've checked all are available on 10.7. <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/core-foundation-rs/108) <!-- Reviewable:end -->
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