#10 implement Blogger APIs

[Lukas Petrovicky]

to make U-blog! support various blogging software,
especially those on mobile phones, we need to add an
interface to communicate with these devices.

this interface should be referred to as an external
interface, with a special password, different from the
normal user password.

with this external interface functionality, we could
support many more features - e.g. accepting or denying
comments without having to log in to administrative
area. maybe just by using a link received in an e-mail.