Trust and Reputation

Applied to Babble on growing trust by Ruby ago
Applied to EigenKarma: trust at scale by plex ago

Changed the name from 'Trust' to 'Trust and Reputation'. I think 'Reputation' should also be a tag, but it's close and related enough to 'Trust' that I think they can share the same tag. 

Also, a reminder that this tag needs a description. If you think you can write it, go for it.

Applied to Charging for the Dharma by jchan ago