closes#5808
refs #5816
- adds additional filtering any 'slug' containing content in `renderChannel` for frontend
- adds test for invalid characters in tag slug
refs #1833
- move RSS tests to be in rss_spec.js
- improve RSS test coverage
- fix a bug with RSS title generation for tag RSS feeds
- replace custom code in processUrls with urlJoin
Refs #5097
- All drafts will show a preview link (this needs real css)
- Published posts will redirect
- prev/next post helpers only activate on published posts
- Powered by ~10 pints between the two of us (@ErisDS, @novaugust)