Added guard to make people think before adding a parameter.

Adding parameters has SEO and caching implications and we should think really carefully before doing so.
Fixed issue with older non-threaded articles.
Merge pull request #997 from guardian/discussion

Fixed issue with older non-threaded articles.
Merge branch 'master' of github.com:guardian/frontend into parameters
Fixed issues with comment loading on articles without bylines
Merge pull request #998 from guardian/discussion

Fixed issues with comment loading on articles without bylines
Merge pull request #979 from guardian/parameters

Added guard to make people think before adding a parameter.
Merge branch 'master' of github.com:guardian/frontend into accessibility-discussion

Conflicts:
	common/app/assets/javascripts/modules/discussion.js
Align non JS comments pages in the page