[988] Upgrade pdf.js libraries and dependencies
[#988] remove minified files as they are out of date
[#988] Update images and html from pdf.js
[#988] Customize viewer.js and viewer.css so that it works with ckan
[#852] Added OG meta information to the dataset and resource pages
[#1008] Catch ValueError when resource's size is not an int

Fixes #1008.
Update .gitmodules

Update .gitmodules to get sphinx through https on github
Merge branch 'master' of github.com:okfn/ckan into 1014-sphinx-theme-git-url
Merge branch '1014-sphinx-theme-git-url'
Merge pull request #852 from okfn/852-meta-information

Improve description when using social sharing links
Merge pull request #988 from okfn/988-upgrade-pdf-js

Upgrade pdf.js
Merge branch '1009-ValueError-when-resource-size-is-not-an-int'