v0.6.1

Changes:

• Integrate functionality changes of 0.5.x branch back into 0.6.x.
• Align twitcher.adapter features of 0.6.x branch to support 0.5.x behaviour.
• Revert removal of ServiceStoreInterface to provide relevant implementation details to external adapters.
• Apply missing interface classes as bases to default implementations.
• Add owsproxy_uri in frontpage response.
• Use hybrid_property to provide direct twitcher.models.Service.verify setter instead of protected _verify.
• Add more logging and handling of errors to catch cases where adapter doesn't return a valid Service instance.
• Add scoped_session to session_factory object to ensure distinct connections and transactions are created for
  concurrent requests.