Remove earlier built-in version of rack middleware
Don't need built-in Librato::Rack module definition anymore
Remove dependencies that librato-rack should take care of
Remove collector libraries as we don't need to provide them anymore
Remove worker loop logic
Remove old version of validating queue
Don't need tasks since we don't have any
Remove defunct requires
Remove worker & modules we don't have anymore
Refactor configuration to subclass lib-rack Configuration class
Update tests for new class-based configuration
Remove old collector tests
Remove old worker test
Remove old delegations for root-level Librato module
Remove source checking since we don't handle it anymore
Removing legacy config-related code
Remove environment/server detection code
Remove root-level test since it isn't of value anymore
Override version string as appropriate
Remove collector / reporter startup code