Use nonatomic for UI properties

Signed-off-by: Blake Skinner <bskinner@mit.edu>
Libraries modernization

Flip on ARC for the rest of the WorldCat related classes, clean up the properties and switch to subscripting for arrays and dictionaries

Signed-off-by: Blake Skinner <bskinner@mit.edu>
Libraries modernization

Flip on ARC, clean up the properties and switch to subscripting for arrays and dictionaries

Signed-off-by: Blake Skinner <bskinner@mit.edu>
Add a method to get a default background queue for dispatching requests

Signed-off-by: Blake Skinner <bskinner@mit.edu>
Dispatch requests onto the default queue (if we don't have another one available).

Signed-off-by: Blake Skinner <bskinner@mit.edu>