updating contributing guide
Update CONTRIBUTING.md

Added branch naming conventions for feature and defect
Minor defect fixes
- Removed datauri favicon
- Manual registration of angular app to prevent conflicts w other possible angular apps on the page
- Fixed issue with output pane's resource path showing incorrect value
Merge pull request #14 from Adobe-Consulting-Services/defect/aem-fiddle

Minor defect fixes
changing package group to be more modern and non-internal. fixes #9