GovspeakHelper#extract_number_from_heading now only extracts numbers at the start of the heading string.
Correct meta data url for worldwide priorities
Merge pull request #814 from alphagov/manual-html-version-number-fix

https://www.pivotaltracker.com/story/show/56344590

Fixes issue with display of html versions with manual numbering where numbers not appearing at start of heading text were being extracted.
Merge pull request #815 from alphagov/56368396-fix-worldwide-priority-links

Correct meta data url for worldwide priorities

https://www.pivotaltracker.com/story/show/56368396