Fix rdoc copy/paste title.
Version 0.4.3

Just fixing the gemspec.
Fix calls for scroll and cursor pos callbacks.

They were for some reason expecting 4 arguments instead of three, which
is weird enough as it is. Weirder still is this was _working_, which is
just scary.
Fix window position, size, and framebuffer size callbacks.

Was setting their enabled status using incorrect method names. The size
callback was working previously, so I'm not entirely sure what happened
there. Possibly using an older version by accident.
Version 0.4.4

Fix callback bugs. See the commit log leading up to this version for
the details.