Added forgotten dependencies update.
Fixed fastpastebin crash when database isn't available and added cute
error screen for informing users about such condition (both HTML and raw).
Added captcha generation. As we're working without JS - there is no
possibility to reload image, only if user will reload whole web page.
Some design works - set monospace font for paste textarea (will
use system-defined default monospace font) and lowered font size
in paste views.
