Renamed unit tests to have unit-test- prefix
Forgot to add files in commit
Merge branch 'master' of https://github.com/alancutter/web-animations-js
Revert "Merge branch 'master' of https://github.com/alancutter/web-animations-js"

This reverts commit 6caac7abf6186c943df949d33b0181f02c5c14a1, reversing
changes made to 9e3a733599cb9114046f42d60f370bf0eeb4f664.