Updated mediawiki/extensions
Project: mediawiki/extensions/VisualEditor  30f2619c144f658732d40dff20bc1ac40a61fdf3

[Browser test] New test for switching between editing modes

1) Using native page-objects methods for dealing with Javascript alerts.
2) Added tags to feature file per reviewer comment.

Change-Id: I3e9d9ae16f1c880878c8e198c647376a0b9aed37