Add Beacon tests http://www.w3.org/TR/beacon/#4024

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toddreifsteck wants to merge 2 commits intoweb-platform-tests:masterfrom

MicrosoftEdge:sendBeacon

Commits on Oct 18, 2016

Add Beacon tests
toddreifsteck
committed

Commits on Oct 20, 2016

Update paths to be absolute per the linter
toddreifsteck
committed