* minro code edits
* Added support for acknowledging code of conduct
- Added CodeOfConduct component that shows links and a checkbox that must be acknwledged before seeing the public galley
- Added verbose message for notebook publish error (when another notebook with the same name exists in the gallery)
- Added a feature flag for enabling code of conduct acknowledgement
* Added Info Component
* minor edit
* fixed failign tests
* publish tab displayed only when code of conduct accepted
* added code of conduct fetch during publish
* fixed bug
* added test and addressed PR comments
* changed line endings
* added comment
* addressed PR comments
* 1) Updated mongo collection create pane to display a better error when a shard key is ill formed.
2) Updated an error message to use double quotes since no string interpolation is used. I thought it was included in a previoue PR but I guess the change didn't get staged.
