core/query: sort accounts reverse chronologically
core/query: sort accounts reverse chronologically

Sort accounts in reverse chrnological order. We can use the ID for
this because of the ID scheme we're using:

http://instagram-engineering.tumblr.com/post/10853187575/sharding-ids-at-instagram

Closes chain/chainprv#1456.
Reviewers: da39a3ee5e6b4b0d3255bfef95601890afd80709@jeffomatic




chain/chain,chain/chain,chain/chain,chain/chain,chain/chain,chain/chain