If user switches to recent repos tab and then switches away, there's really no
point in pushing everything into store. We can still reject all of the events
for repos that don't belong to the current user and are not yet in the store.
If user is logged in and doesn't keep 'recent repositories' tab opened, most of
the pusher events from 'common' channel are useless.
This commit introduces a logic to reject pusher events if:
* recent tab hasn't been opened
* user is signed in
* Travis CI for open source is used
* repository for a given event is not yet in store
* repository for a given event is not part of current user's repositories
