Version 2.0, New features + fixes

- Upgraded Octokit from 0.3.4 to 0.4.1.
- Changed current version from 1.0 to 2.0.
- Fixed the About dialog layout
- Added context menu on list items: go to repo, go to issues, add to
ignore list.
- Added an option to turn animations on/off.
- Added functions for enhanced config management of collections.