Check Open Graph via html-proofer (#185)

* Remove errant .DS_Store file

* Ignore .DS_Store

* Create a list of organisations

* Add an org list

* Show number of PIDs per org

* Fix HTML issue, sort orgs by title

* Try and fix the PID count

* Try and fix issues

* Try again to fix issues

* Try yet again to fix issues

* Correct the urlpart

* Change to sort_natural, minor code tidy

* Try and fix the sorting

* Try again to fix the sorting

* Remove debugging

* Add a link to orgs page

* Install dependencies for Travis

* Create .travis.yml

* Add the Travis script

* Update the Ruby version

* Bump the Ruby version some more

* Switch back to the documented version

* Add the exclude

* Update based on jekyll/jekyll#5413

* Add github-pages Gem

* Add missing gems

* Add redcarpet

* Switch to tasks so we can run multiple CI tasks

* Switch to tasks

* Fix the matrix

* More matrix fixing

* Turn on more htmlproofer options

* Make the check less strict

* Don't bother complaining about extra jekyll tags

* Escape HTML entities

* Fix the email link

* Fix the link within the 404 page!

* Escape more HTML entities

* Remove an invalid site URL

* Cache ruby bundles

* Escape even more HTML entities

* Escape yet more HTML entities

* Escape more HTML entities and switch to a div

* Try and fix the errant paragraph item

* Add a Travis badge to the readme

* Update Gemfile

Adapted from https://github.com/lunaryorn/lunaryorn.github.io

* Update _config.yml

* Add some more checks to Travis

* Report GH Pages versions

* Tidy up, add redcarpet back in

* Try and stop the spurious paragraph tags

* Check Open Graph

Author: peternewman

.travis-ci.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -e # halt script on error
 
-HTMLPROOFER_OPTIONS="./_site --check-html --report-missing-names --log-level=:debug"
+HTMLPROOFER_OPTIONS="./_site --check-html --check-opengraph --report-missing-names --log-level=:debug"
 
 bundle exec jekyll doctor
 bundle exec jekyll build