Obfuscate consumer urls

Several internal changes and bug fixes

• Dropped pubsub in favour of pulsar channels
• Redis backend uses namespace for both channels and queues
• Better serialisation support for messages
• Added register_broker function to api
• Added queue_message function to api

Backward incompatible release with a considerable amount of internal and API refactoring

• Ability to add additional consumers to the queue server (see pulsar-twitter for example)
• Each consumer is an attribute of the server queue api and backend objects
• Renamed TaskFuture to MessageFuture
• Handle max_retries with retry_delay
• TaskError can be used in order to avoid a full stack trace dump. It means it is a TaskError handled by the Job callable.
• Added timeout to task execution
• Max concurrent tasks is a linear function of number of cores and concurrent_tasks parameter

Several backward incompatible changes. This version is not compatible with the 0.3 series
and brings several bug fixes, enhancements and almost 100% test coverage.

• Added TaskManager for better customise the task queue application
• Added message serialisers - json and msgpack
• Consumers can run on a single process b392f82
• Allow to queue tasks with a delay 3ed7d7a
• Handle drop connections from pubsub and message queue broker
• Enhanced documentation

• Increased code coverage
• Fixed RPC server
• Increased documentation
• Bug and API fixes

• Major code refactoring with introduction of submodules
• Task queue Backend has Pubsub and Message queue handlers

• Works for python 3.5 and above
• Increased test coverage
• New test suite
• Development status set to Alpha

Internals

• Run the CPUBOUND tasks in a child greenlet