Wiki accout creation now handled synchronously.
Error handling added for all wiki errors, now wiki_user_query handles ambiguous usernames with a warning email.
Updated email error messaging, tightened wiki username checking.
Moved wiki_errors, fixed g.wiki_url usage.
Users without email addresses get PMs notifying them if we can't determine if they have a wiki account.
Merge pull request #95 from PotatoDumplings/wiki_revisions

Wiki account creation now handled synchronously.