Updated mediawiki/extensions
Project: mediawiki/extensions/Echo  bb6eef198ca50c5b8adf052cf28d0ebddc89413e

QA: Add some basic browser tests

yippee ki yay!
Tests basic functionality
1) presence of Echo button
2) behaviour of clicking Echo button

Change-Id: I6334264e1ee73a59da1e7b0c3f18a1d43b565f3a