[webui] fix the links to 'Owned Packages'
[backend] implement load forwarding to the master dispatcher
[webui] don't specify format in the feed

Rails will add .html, but that is invalid as . is part of the package name
[backend] ppc64 build hosts are able to build for ppc64le and vice versa
[backend] prune notification info
[backend] forwardevent: don't die if one arch cannot be notified
[api] the backend will send different payload for build events now
[api] trying to fix db:migrate (issue 512)
[api] continue trying to fix 2.3 migrations
[api] even more fixes for issue 512
[api] final test for issue 512

This time I made my own 2.4 dump to test with ;)
[api] one more payload key for build events
[api] also fix the deleted repo if not existant

This is already part of the 2.4 fixtures, but not in real life
[api] add the possibility to subscribe to events

You can subscribe globally or on project/package leel if you want to
get notifications (not yet implemented obviously) for events either for

 - none (overwriting more global defaults)
 - project maintainership
 - package maintainership
 - all
[api] start of an action mailer for events
[api] add current hermes templates in erb format
[api] move the notification templates in the right place
[api] actually send the mail to subscribers
[api] test the emails sent out
[api] remove events for review/request accepted/declined/revoked

Noone subscribes to these, statechange/change offer the same