Merge pull request #287 from malthe/shed-times-dependency

Remove dependency on 'times' library (issue #286).
Ignore .envrc files.
Add wheel support to RQ.
Remove `times` dependency from requirements.txt.
Unpickle job data lazily. This fixes issue #294.
Move seemingly general purpose decorator into class scope, use and delete.

Also, reduce repeat attribute declarations, at the cost of a
requirement that decorated functions appear in the right order.