no issue
- removes the few uses of `Ember.on` for lifecycle hooks or event hooks where order may be important
`Ember.on` use is discouraged so although we haven't used it often I felt like we should ensure we're consistent throughout the codebase. There's a great article with details of why it's discouraged here: http://notmessenger.com/proper-use-of-ember-on/
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
