Updated mediawiki/extensions
Project: mediawiki/extensions/VisualEditor  c6a002110eb91c0eba5190fd248412a2910c214a

[Browser test] Add waits for SauceLabs happiness

1) when_present waits to deal with SauceLabs sluggishness
2) Restore a "sleep" method for running test locally

Change-Id: I692befa5da607cf2468e3a56eb9b634a17f8deb2