Allow boolean operators.

We have escape some of them anyway if they are used wrong, but that
isn't too bad.

Bug: 56026
Change-Id: Iaeedda690b321b1282d9a36505823fa9ab851796
Tests for boolean operators.

Also, update the logging in instructions after switching to the
mediawiki-selenium gem.

Bug: 56026
Change-Id: I1efbb677a679b639b07c3a0ef3e1aca8fe74f6e5
Merge "Allow boolean operators."
Merge "Tests for boolean operators."