check for duplicate <hr>
For PR|PER, check that the SOTD contains a link to wbs
use info message instead of warning
PR #40 (check for duplicate <hr>).

Simplified conditions in the rule.

Added a new test case.
Merge pull request #40 from w3c/headers-hr

check for duplicate <hr>
PR #42 (For PR|PER, check that the SOTD contains a link to wbs).

Added a couple of test cases for this new rule.
Merge pull request #42 from w3c/denis/pr-per-ac-review

For PR|PER, check that the SOTD contains a link to wbs
Merge branch 'master' into denis/html-messages

Conflicts:
	lib/l10n.js