Added strike through support to Markdown
Fixed dangling postscore and crossref rows
Fixed user view tabs
Added unique indexes
Merge remote-tracking branch 'upstream/master'
Fixes to Markdown parsing introduced in 7605177
HTML validation
Added support for OpenGraph

- Linking to index and individual posts produces thumbs on sites like Facebook
- Thumbnails theoretically support custom sizes
Merge remote-tracking branch 'upstream/master'
Removed TextHelper hacks
Merge remote-tracking branch 'upstream/master'
Version upgrade (0.4.1)
Merge remote-tracking branch 'upstream/master'