Auto merge of #14561 - Impally:master, r=Manishearth

font-variant-caps implemented in font.mako.rs

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Implemented font-variant-caps for gecko library

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #13668  (github issue number if applicable).

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- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____
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Before Change:

<img width="261" alt="beforechange" src="https://cloud.githubusercontent.com/assets/9249887/21127332/03487fbc-c0c0-11e6-8667-bb1e60d5c754.PNG">

After Change:

<img width="174" alt="afterchange" src="https://cloud.githubusercontent.com/assets/9249887/21127345/0cc8860e-c0c0-11e6-96cf-16b77c14c5a7.png">

Pictures are rendering of example from [font-variant-caps](https://developer.mozilla.org/en-US/docs/Web/CSS/font-variant-caps)

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