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Now that we support interfaces for directional trust, this will
allow for more complicated trust decisions that might not only
happen at the moment of session creation.

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1) Allow IdentityKeyStore to make trust decisions based on
   direction of received identity key (incoming vs outgoing)

2) Have IdentityKeyStore reflect whether a save operation reflects
   a replacement, and build in previous session cleanup to the
   library rather than leaving it as an application concern.

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Although it helps to eliminate confusion when people inadvertantly
scan the wrong code, people might share the QR code image publicly
and inadvertantly publish their identifier.

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Optionally allow for per-device identity

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Fixes #22
Closes #23

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