chore(bower): upgrade angular to 1.3.3. Remove
bindonce (incompatible). Note, bindonce="..." attrs still need to be
converted to their {{::}} equiv for better performance, but this is
functional for now
chore(modules): add angular-filter
fix(webhooks): sort webhooks by created, use angular-filter for sorting object
feat(private-messages): start implementing private messaging (includes blocking). Start experimenting with reflists for PMs, instead of arrays