Link reports to issue tracker ticket

[preaction]

Similar to #21, we should have a way to link a set of reports to an issue tracker ticket.

We should create a list of the reports, allow users to select multiple reports, and let them click a button to assign them to a tiket. The button should pop-up a dialog to enter the URL to the ticket and a comment about why these reports are being related (for example These are all caused by the tests being run during a DST change.)

This will require implementing the mockup for listing the reports for a given dist release (https://github.com/cpan-testers/cpantesters-web/blob/master/share/templates/dist.html.ep). A simple text input form on the beta landing page can get users to the page for their dist.