Misc tweaks/fixes (fixes/closes issue 17 & 323).

Mostly small stuff here.

* Cleaned up the update ext to be a bit less error prone. Gave it the [Beta] tag since it still needs a bit of work.
* Commit eb16ab09edd694e09bc040b6564551e77f0e3afa & e8607ab6f2b535f4f02e3e5cf4cb318cb1f2ac02 should close #17.
* Commit c065e3814555f9ad7204d0f9ec4f5081bce9ed20 should close #323.
* Metatags are now case insensitive. This will probably be a tad slower, but it makes it easier on those who aren't too friendly with these kinds of imageboards.