Added modal functionality

Now when you click a link a preview modal will be shown allowing you to
preview the ticket text and link the current ticket to that problem id.
Edited notifications

Now when a ticket is updated, apart from having a notification alert in
the top, the notification should have to be kept inside the top_bar app.
Merge pull request #6 from abelmartinromero/jeremiah/savehook

:+1: Jeremiah/savehook