Duck typing is great let's do more of it

Don't hardcode which exception is to be considered an HTTP error, instead
embrace the duck typing philosphy and make any exception that have a get_response
method an HTTP Exception.

The rational behind this, beside the obvious advantage of duck typing over hardcoded
exception and subclass check, is that we don't want to be stuck with using Werkzeug
exception classes, since this later is hard to extend !
Merge pull request #64 from mouadino/more-duck-typing

Duck typing is great let's do more of it
Log event handler errors
Merge pull request #65 from emulbreh/log-event-handler-errors

Log event handler errors
Added uuid serialization support
Merge pull request #66 from emulbreh/uuid-serializer

Added uuid serialization support
Added monitor_endpoint configuration option
Added docs for monitor_endpoint config
Propagate monitor endpoint to instances
Always set a default monitor endpoint
Merge pull request #67 from emulbreh/master

Added monitor_endpoint configuration option
Allow observing more than one action at once
Reject kombu messages on error
Log monitor endpoint
Removed gevent version requirement from setup.py