Additional stats, reconnection improvement, new 424 response code

- Update to a base request class for stats
  - Track all requests in a new 'requests' value in the stats handler
  - Selectively use Python 2.7's counters.Counter class
- Count the number of failed connection attempts and permanently set a specific connection to deny publish requests when exceeded, sending 424 response code
- Update to use pika 0.9.13p0 with refactored connection closing
Update to 0.0.5