add: wrapper for Queue

[metaist]

It's a little awkward calling ezq.put_msg and ezq.iter_msg. I think I'd prefer:

q = ezq.Q() # simple constructor
q.put(data, kind='special', order=1)  # constructs the message

for msg in q: # simple iteration
    # something with msg.data

q.end()

[metaist]

A quick test suggests this is kinda nice. Maybe I like this better than the functions.

[metaist]

Why not both? Because idioms matter and the examples will be what people remember.

Ok, but why not both, under-the-hood. Like keep the functions as the primitive operations, but include the wrappers for convenience.

Maybe. Will probably keep both for a little bit to see what it's like.

[metaist]

Of course now the functions for creating the workers and ending them feel weird.