Created new domain and settings page to create trackers #2

revizor-2 Add issue tracker's support
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
User can assign existing review to an issue ticket #2
Minor update #2
Revizor can notify the YouTrack thart review was created or closed #2
Corrected Wiki markup #2
Minor (but very important) bugfixes #2
Add cache in order not to call data from remote Issue Tracker every time. This closes #2

When we load information to an ticket, it is actually loaded from remote
Issue Tracker. This is potentially expensive operation and it consumes
the network traffic. We cache this tickets locally to improve performance
and save traffic.
Merge pull request #18 from w32blaster/revizor-2

Revizor 2