Marketsense improv

 - Pin dependencies in setup.py.
    Some package versions were update in the process.

 - Module `ccouchdb` can be called as a script.
    When called as such, it will sync a design document written as a YAML file to a given database.
    [#47442765]

 - Fix bug terminated instances returned by `aws.ec2.all()`.
    All instances were previously returned and not just those running.

 - Add a `update_feed` function to `ccouchdb`.
    Returns a continuous feed of update to a given database.

 - Remove the connection pool instantiation in module `cache`.
    Redis is already using a connection pool by default.

 - Add missing *pusher* requirement.
    
 - Add a `count` function to module `rqworker`.
    `Count` returns the number of queued jobs to a Redis queue.