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'`
- Change fixture response of posts route to actual format.
- Extracted classNames logic of routes into style-body mixin.
- Additionally replaced all double-quotes with single-quotes for style conformance.
