Begin of Facebook Integration

[Tomaz Canabrava]

People,

Facebook integration is still *extremely* experimental.
that means that there's only one person that can login with subsurface yet:
me.

This is a pre-alpha code, nothing breaks, so it's safe to merge.
It doesn't do anything yet besides logging in, saving user info and logging
out, but since dirk really want some patches, there you go. :)

next: publish dives.

Tomaz
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