Fixes to make redis-to-ironmq work

- namespace fixes
- set logger in redis-to-ironmq
- add topic name to encrypted message, don't try to get it by
  get_const-ing the payload class
- require active_support where we need it
- put_back_on_queue should use rpush, not lpush
- add bin/ to gemspec
Add begin/rescue in emit()

- Without this we silently lose all exceptions since it runs in after_commit
Fix in-progress queue name