Add iid field to issues and MR
Sett iid on create. Use iid as value to_param
Create task to create iid for existing issues/mr
Find issues and Mr by iid in controller
Show iid as default id for issues, mr
Show iid in event feed and uatocomplete as default id for issues, mr
Iid improvemets

* call set_iid before validation
* make rake task pass event if objects are invalid
* show iid in comment event at dashboard
Fixing tests after adding iid for issues/mr
Searching for issue/mr by iid in markdown
Fix tests
Merge branch 'feature/internal_ids' of /home/git/repositories/gitlab/gitlabhq