* 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
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