Fixed the build tags for the alt database engines.
Tweaked the quotes on the PgSQL adapter. Still not functional.
Removed the SQLite build tag as it's unlikely that it'll ever be implemented.
We now track stats for Uptimebot.
We now track stats for malformed requests.
Added json as a valid column type.
Continued work on poll posts.
Added the polls table.
Added the polls_voters table.
Added the poll column to the topics table.
Changed the type of the poll column on the replies table from boolean to int.
