Fix promise rejection

fixes #3013
- bubble promise rejection on post model validation/save error so that it doesn't bubble as resolved
- prefer `.catch()` for promise handlers as per recommendations
- check if `.save()` is being called from model.destroyRecord() and forgo validation if so
- normalize output for both `.validate()` and `.save()`
Fix word count in ember.
Merge pull request #3023 from darvelo/promise-rejection

Fix promise rejection during validation
Merge pull request #3033 from halfdan/fix-word-count

Fix word count in ember.
Fix warning about transitionTo being deprecated
Re-implementing the loading indicator for the Ember admin

closes #2855 , closes #2848
- New  mixin that utilizes NProgress for displaying a loading indictor for all routes who's model issue a "loading" event (aka: when requesting data from the server during a route change).
- Also removing (the now unnecessary) "loading" template.
Focus title in editor when opening page.

closes #3038
- Adds new gh-focus-input component
- Uses new component in editor
Adding more ember admin tests

- improving the implementation of thenOpenAndWaitForPageLoad
- adding a class into the settings templates to more easily test which pane we are on
- adding more, and updating more of the settings tests
- added the editor tests
Merge pull request #3024 from morficus/nprogress-loading-indicator

Re-implementing the loading indicator for the Ember admin
Merge pull request #3034 from ErisDS/more-tests

Adding more tests for settings
Merge pull request #3039 from halfdan/3038-focus-title

Focus title in editor when opening page.
Merge pull request #3014 from ErisDS/issue-3013

Check for undefined model
Better editor entry

Ref #2308

- Double clicking a PostItemView on the content screen will open that post
  in the editor.
- Added `'ctrl+e, command+e': 'openEditor'` shortcut will open editor as well
Merge pull request #3021 from novaugust/doubleclick-to-edit

Easier editor entry
Switch Ember initializers to public API methods
Hide settings/apps unless apps:true is in config.js

fixes #3031

- Adds an initializer for passing config to the frontend, it's not pretty but it works
- Forwards the apps route and hides the apps menu item if apps:true is not present in config.js
Implements character count helper.

closes #3035
- New character count helper
- Re-add casper test for bio count
- Change settings.general and settings.user to show character count
Trim title in editor on blue/focusOut

closes #3040, fixes #3038
- Properly trim title
- Re-add casper test/adjust where necessary
- Rename gh-focus-input component
Merge pull request #3041 from ErisDS/issue-3031

Hide settings/apps unless apps:true is in config.js
Merge pull request #3043 from jaswilli/initializers

Switch Ember initializers to public API methods