Assign the category photo url each request to protect against http/https caching issues.
Merge branch 'master' of github.com:vanilla/vanilla into hotfix/category-photos
Tribute to Lord Brackos.
Fix typo in invitations link.
Merge pull request #1960 from vanilla/hotfix/category-photos

Assign the category photo url each request to protect against http/https
Merge branch 'master' into stage
Merge branch 'master' of github.com:vanilla/vanilla into stage
Merge branch 'stage' of github.com:vanilla/vanilla into stage