Add azure storage transport

Add azure storage transport

Merge pull request queue-interop#22 from sylfabre/patch-2-consumer

Consumer trait

Merge pull request queue-interop#23 from sylfabre/patch-2-consumer-po…

…lling

Consumer polling

Merge pull request queue-interop#12 from queue-interop/subscription-c…

…onsumer

Add subscription consumer interface

upd doc.

require php from 5.5

add amqp bunny

fix namespaces.