Make dev look like prod

There is no need to have a prod environment in this example project.
Make dev behave like prod for the benefit of benchmark tests.
Add additional configuration options

Ability to specify bunny's network recovery interval; and whether to
auto delete the queue and exchange (helpful for cleaning up after
running tests).
Bump version

New minor version to indicate significant changes to internal behaviour
of rabbit_feed
Make logging more consistent with other example project
Remove connection recovery

Connection recovery in bunny has improved since the creation of
rabbit_feed. The purpose of this change is to simplify rabbit_feed by
letting bunny manage its own connection recovery.