Add new domain IssueTracker and all the View files #2

revizor-2 Add issue tracker's support
Add new domain Issue Ticket #2

revizor-2 Add issue tracker's support
implement Issue Tracker support  #2

revizor-2 Add issue tracker's support
implement GitHub support  #2

revizor-2 Add issue tracker's support
implement YouTrack support  #2

revizor-2 Add issue tracker's support
Notify YouTrack about new review #2

When user creates new review using Smart Commits,
the Revizor automatically sends notification to YouTrack that
a new review was created.
revizor-2 Add issue tracker's support