Add JIRA ticket to existing Sentry group

[Jayanth Raman]

The JIRA integration to sentry is very nice.

One feature request: It would be great to add an existing ticket to a group.  Some scenarios where this is useful:

• Multiple exceptions are most probably due to the same issue.  Create one and link the other(s).
• There is already an existing ticket for the same issue.

It would be nice to see that there is a ticket for every (unresolved) exception group on the Sentry dashboard.

Sentry is awesome!

Thanks.

-Jayanth