supersedes #6773
- update `feature` service and `gh-feature-flag` component to work synchronously rather than async
- use the application route's `afterModel` hook so that settings are loaded before first load
- override `session` service's `authenticate` method to load the settings after successful authentication before any other routes are processed
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
