The configuration is automatically generated if a repository group is changed.
This is problematic in a case where no repository groups are used (yet).
Therfore an option is needed to start the geneartion manually.
* added db migration for integration table, version 55
* added integrations views/templates/models
* added slack integration
* added h.url.current() support for pyramid only contexts
* added issues extractor for commit messages
* renamed repo-deleted/repo-created to repo-delete/repo-create
* removed marshmallow
* added serialization for events to static dicts of data
* added lazy_ugettext for translation of start time string
