Unescape HTML entities in usernames.
Fix "alternate server" setting row's title.
DRY up serializing JSON non-collection values.
Remove first stylesheet load detection from posts view.

By far the most common of the many reported WebKit crashes has to do with
finishing loading a resource. The first stylesheet load detection in the posts
view used an onerror handler on an <img> element, which probably gets triggered
after the resource finishes loading. It seems prudent to remove anything even
remotely tricky when loading a resource, so this is gone.
Avoid flash of unstyled content in posts view.

By inserting the CSS inline with the HTML for the first load, we can avoid the
flash.