fixed couple of specs, removed the federation fallback, and fixed the public hashtag pages (not displaying the publisher)

add tests for object_should_be_processed_as_public? and delegegated public to the parent of relayable objects

As resque-web is considered as a debug tool, route is disabled for
production by default, and can be enabled via the `mount_resque_web` key
in application.yml.

This reverts commit 6a887a6d99899b9876e3145fb0a8b92ce2a405cf.

edit app+_config to look for heroku's ENV['STACK'] config var; load settings from ENV hash instead of application.yml if on heroku