Introducing resque-unique_by_arity

Magic hacks which allow integration of job multiple Resque plugins providing different types of job uniqueness

Because some jobs have parameters that you do not want to consider for determination of uniqueness.

resque_solo and resque-unique_at_runtime (a resque-lonely_job rewrite) will now work together! Without this gem they are fundamentally incompatible.

I’ll put something here soon.