Always run tests as multisite because we need to make sure author queries behave properly
More prep for multisite tests
Model core's behavior when determining whether the author archive should be displayed

The author archive should be displayed when the user is a member of the blog, or the user has a previously published post on the blog.

The author archive shouldn't ever be displayed when the user has no published posts on the blog.

See https://core.trac.wordpress.org/changeset/27290

Fixes #133, #169
Only try to reassign if the `$_POST['reassign']` is set.

Sadly, it's not actually passed through the action
Update readme for #159
Test state when user has been deleted.
Merge pull request #179 from Automattic/fix-author-queries

Fix behavior for author queries