Marconi progress and updates

Marconi Redis is one step closer to being a proper backend for Marconi:

``` alejandro@rainbow-generator:~/Development/marconi-redis:[master %>]$ tox -e pep8 GLOB sdist-make: /home/alejandro/Development/marconi-redis/setup.py pep8 inst-nodeps: /home/alejandro/Development/marconi-redis/.tox/dist/marconi-redis-backend-0.8.0.a37.gb18597a.zip pep8 runtests: commands[0] | flake8 pep8: commands succeeded congratulations :)

```

``` RedisCatalogueTests test_catalogue_entry_life_cycle ERROR 0.02 test_exists ERROR 0.01 test_get ERROR 0.01 test_get_raises_if_does_not_exist ERROR 0.01 test_list ERROR 0.01 test_update ERROR 0.01 test_update_raises_when_entry_does_not_exist ERROR 0.01 RedisClaimTests test_claim_lifecycle ERROR 0.02 test_do_not_extend_lifetime ERROR 0.03 test_expired_claim ERROR 0.01 test_extend_lifetime ERROR 0.03 test_extend_lifetime_with_grace_1 ERROR 0.03 test_extend_lifetime_with_grace_2 ERROR 0.03 test_illformed_id ERROR 0.01 RedisDriverTest test_control_db_instance OK 0.00 test_data_db_instance OK 0.00 RedisMessageTests test_bad_claim_id OK 0.01 test_bad_id OK 0.01 test_bad_marker OK 0.01 test_claim_effects FAIL 0.03 test_expired_messages FAIL 0.01 test_get_multi FAIL 0.03 test_message_lifecycle OK 0.01 test_multi_ids OK 0.01 RedisQueueTests test_list_None OK 0.02 test_list_project OK 0.02 test_queue_lifecycle ERROR 1.23 test_stats_for_empty_queue OK 0.01 RedisShardsTests test_create_replaces_on_duplicate_insert ERROR 0.00 test_create_succeeds ERROR 0.00 test_delete_nonexistent_is_silent ERROR 0.00 test_delete_works ERROR 0.00 test_detailed_get_returns_expected_content ERROR 0.00 test_drop_all_leads_to_empty_listing ERROR 0.00 test_exists ERROR 0.00 test_get_raises_if_not_found ERROR 0.00 test_get_returns_expected_content ERROR 0.00 test_listing_simple ERROR 0.00 test_update_raises_assertion_error_on_bad_fields ERROR 0.00 test_update_works ERROR 0.00 Ran 40 tests in 1.679s

FAILED (errors=27, failures=3) ```

In short:

• Shards and Catalogue are not yet implemented (19/30 failures in 19 tests)
• Claims are all wonky (7/30 failures in 7 tests)
• Queues have some quirks (1/30 failures in 4 tests)
• Messages have some quirks (3/30 failures in 7 tests)

Support for both FIFO and non-FIFO Redis is baked in. All it takes is flipping one configuration option and it just works:

conf [queues:storage:driver:redis] fifo = True

More updates coming tomorrow.