TISTUD-5104 List open pull requests for git repo attached to github, selecting PR opens in browser
  - Add binding for viewing pull requests, add to new Team > Pull Requests submenu
  - Add title to the quick menus used by bindings for git operations on remotes/branches
Fix up unit tests
Merge pull request #94 from sgtcoolguy/TISTUD-5104

TISTUD-5104 List open pull requests for git repo attached to github, selecting PR opens in browser