refs #6640
- add `NotFoundError` to ajax service and test against that when catching errors in `gh-profile-image`
- don't use `passthrough` in Mirage for gravatar requests to avoid network calls during testing
- add additional tests for `gh-profile-image` and put the debounced gravatar test back in place
Closes#5882
* If a gravatar image is available, remove the default image behind it
* If gravatar image is not available, keep or replace the default image
no issue
- add ember-suave dependency
- upgrade grunt-jscs dependency
- add a new .jscsrc for the client's tests directory that extends from client's base .jscsrc
- separate client tests in Gruntfile jscs task so they pick up the test's .jscsrc
- standardize es6 usage across client