Quick fix to gallery test while I'm removing other stuff.
Removing section that's now covered in webdriver
Article test is now covered in webdriver tests
Removed tests checking for presence of comments, covered in webdriver.
Removing commented out tests, as well as Show/Hide/Expand tests that are covered in webdriver. Leaving a persistence test that needs to be put in.
Merge pull request #4545 from guardian/casper-removals

Casper clean