Change Hash.statuses to use mget, reducing the number of redis queries
Change Hash.statuses to use mget, reducing the number of redis queries

The existing implementation makes n+1 queries to redis, this reduces
it to two queries. Overall time complexity is unchanged, but overhead
is significantly reduced.

quirkey/resque-status,quirkey/resque-status,nathan-v/resque-state,georgemillo/resque-status,compwron/resque-status,nathan-v/resque-state,georgemillo/resque-status,compwron/resque-status