Make 3 Pull Requests to https://github.com/codebuddiesdotorg/codebuddies repo

1. Issue 753 fallback image used if image link of contributor is broken or expired
2. Refactor /about page and move description of contributors to JSON file
3. Issue 754 ical support in hangout page

codebuddies 0.9.91 release.
https://github.com/codebuddiesdotorg/codebuddies/releases/tag/0.9.91