Ported settings/apps logic to Ember.
Closes #2423

- Created the apps route to fetch apps from server
- Created controller for a single app
- Modified the template of the apps page to use this controller
- Created the Apps model
- Created AppAdapter to use the FixtureAdapter for Ember Data
Implement Shortcuts in Ember

Closes #2988, #2752
Ref #1463, #2984,
 # Shortcuts via Keymaster
- Added KeyMaster to bower dependencies. KeyMaster is a minimal keyboard
  shortcuts library.
- Added `ShortcutsRouteMixin` for routes that will use shortcuts.
  Currently, only routes can have shortcuts. See the extensive comment
  at the top of `core/client/mixins/shortcuts-route.js` for a
  description of how to implement shortcuts.

 ## Other Changes
- Injected popover service into ApplicationRoute
- Created `EditorRouteBase` mixin for the `editor.new` and
  `editor.edit` routes to mixin.
- `StyleBodyMixin` now calls `this._super()` on `activate` and
  `deactivate` to play nicely with other mixins.

 ## Shortcuts and Stubs implemented
 #### Application-Wide
- `'esc':'closePopups'` shortcut **stub** to close popovers,
 modals, and notifcations

 #### Editor Shortcuts
- `'ctrl+s, command+s': 'save'` note that `command` is the
  `meta` key.
- `'ctrl+alt+p': 'publish'`
- `'ctrl+alt+z': 'toggleZenMode'`
Convert general settings page to ember data

Issue #2846
-Implement custom RESTAdapter and serializer for settings data.
-Convert theme selector to Ember.Select.
-Finish upload modal and wire into settings page.
User API changes

closes #2822
- added destroy user method
- added remove user permission
- added API end point for get reset token
- added API end point for reset password
- added API end point for change password
Merge pull request #2995 from sebgie/issue#2822

User API changes
Add Validations Layer and Post Validations

closes #2893, issue #2850, issue #2856
- this is a stable, but quick and dirty validations layer for the time constraints
- this could be replaced with a unified server/client layer later. the infrastructure is there.
- create a validation engine mixin to match validators with models
- override the save method in the mixin to perform validations first
- create a post validator
- fixup calls to .save() to make sure they catch errors properly
Merge pull request #3002 from novaugust/shortcuts

Implement Shortcuts in Ember
Improving Casper test error reporting
Merge pull request #3003 from jaswilli/issue-2846-settings

Convert general settings page to ember data
Merge pull request #3011 from darvelo/validations

Add Validations Layer and Post Validations
Removing unneeded file
Implement Markdown Shortcuts

Closes #2984, #3020
Ref #1463, #3019

 #### Shortcut Values
Shortcut values can now be either strings (as before) or objects like
{action:string, options:hash}.
 #### Markdown shortcuts added
- 'ctrl+alt+u' strkethrough
- 'ctrl+alt+1' h1
- 'ctrl+alt+2' h2
- 'ctrl+alt+3' h3
- 'ctrl+alt+4' h4
- 'ctrl+alt+5' h5
- 'ctrl+alt+6' h6
- 'ctrl+shift+i' image
- 'ctrl/command+k' link
- 'ctrl+l' list

Left behind commented out stubs for additional markdown shortcuts.

 #### Editor Controllers (New and Edit)
- Moved shared init function into editor-base-controller.
- Removed MarkerManager mixin from editor controllers as it's included in
  the base.
Remove "Delete This Post" option from New Post publish bar menu items

closes #3025
- adds 'unsaved' class to entry-controls when the post model/controller isNew evaluates to true
Merge pull request #2967 from szelpe/settings-apps

Ported settings/apps logic to Ember.
Merge pull request #3026 from darvelo/delete-new-post

Remove "Delete This Post" option from New Post publish bar menu items
Merge pull request #3022 from novaugust/codemirror-shortcuts

Implement Markdown Shortcuts
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.