44e872a427120f2e35c4d6ca4e02ee33f0ca798a
Add CFDictionary function to get keys and values Tests included. No formatting issues this time! <!-- 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/89) <!-- Reviewable:end -->
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