Becky Siegel 82ac09fdd9 Add rel="noopener" to external links
It is recommended to open external links using rel=noopener for both
security and performance reasons.

https://developers.google.com/web/tools/lighthouse/audits/noopener

Change-Id: Ic8fadadbf16f876231345dfdd300a0d2f6a658f2
2016-12-27 13:51:24 -08:00
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