* replace `isEditing` observers with `didReceiveAttrs` hook
* 🐛 Fix HTML card not launching in edit mode
closes https://github.com/TryGhost/Ghost/issues/8310
- adds `autofocus=true` attribute to `gh-cm-editor` that will use CodeMirror's built-in autofocus behaviour
- set HTML card's launch mode to `edit` and ensure that the `autofocus` attribute is passed
- refactor `gh-cm-editor` for more robust event handling
- re-work `ch-cm-editor` tests to take into account CMs events not being triggered within a single run-loop and to still work when the browser window isn't focused (should fix the random test failures on Travis and the issues where the CM tests will fail locally)
no issue
- preparation for using `ember-pikaday` that utilizes `ember-cli-moment-shim`
- removes usage of `moment` global
- removes custom imports of `moment` and `moment-timezone` libraries
no issue
- drop `jshint`, `jscs`, and `ember-suave` dependencies
- remove `grunt` related linting dependencies and tasks
- remove linting build from Travis so that linting can be performed as part of the normal test suite (refs TryGhost/Ghost#7427)
- add `ember-cli-eslint` and `eslint-plugin-ember-suave` dependencies
- configure `eslint` to match our previous coding style
- update config to run eslint tests as part of the normal test run
- add `npm run lint` command to only run linter tests