Represent tips as (tip, signature) tuples
Tests for get signature
Sanely marshall and store signatures
Test deals with untrusted signatures
Nuke a ton of dead user code
Load crypto adaptor on station
Send signatures with responses in airship
Implement lookup of crypto adaptors
Script to sign grefs
Squashed commit of the following:

commit 728df4ad4df0bd097d925174f10188b7edbf4fc0
Author: richo <richo@psych0tik.net>
Date:   Wed Mar 27 09:14:06 2013 +1100

    WIP! include hashes on events for signature validation

commit 01c69b6103e90d80dd861aefd2d9b2e102cdff50
Author: richo <richo@psych0tik.net>
Date:   Wed Mar 27 03:56:27 2013 +1100

    Light up hashes in response to signature data
Show signature status in the UI
Send signature status to the client properly
Use good/bad colours from bootstrap
Give airship the option of a signing key
Clean up styling

This cleans up rendering the css is still scary
Border around input bofixupx
Clean up the input form
Use pygit2 Oid's everywhere.
Merge branch 'features/tip_signing'
Merge branch 'features/pygit2_oids'