Upgrade/jb 0.9.9.13

this pull request basically brings in v0.9.9.13 and moves all Sitepoint changes (themes and plugins) to the end of the history after the version.

In a nutshell this is what happened:
```sh
$ git remote add discourse https://github.com/discourse/discourse.git # add discourse remote
$ git rebase v0.9.9.13 # rebase in v0.9.9.13 tag and move any changes to HEAD
```

This does break some changes to the layout, but they will be fixed in Pull Requests to the theme.
Probably hold off on merging this until layout issues have been addressed...