Fixes static pages when permalinks are active.

fixes #2938
- Fix `page === 1` occurences
- Fix ember logic
Change `posts`, `post` and `signout` routes to be `AuthenticatedRoute`s

No issue
The following is a list of routes which are not authenticated
- placeholder routes: `editor` and `content`
- `application`
- password routes: `forgotten`, `reset`, `signin`, `signup`
Transition user to original destination after signin

Closes #2943
- `AuthenticatedRoute` now stores the user's original destination on the
  `ApplicationController`.
- The `SignIn` route's `login` action checks if the `loginTransition` property is set on the
  `ApplicationController`, and if so, retries that transition after a
  successful login.
Reach Editor parity with Ember

closes #2426, closes #2781, closes #2913
- Concatenate vendor files on change of js in core/shared/
- Add all the markerManager stuff to its own mixin
- make markers a shared object for all that mix it in. makes it easier to use helper functions in different modules
- add getMarkdown method, returns object with two keys holding the markdown: one with markers, the other without
- Clear markers when codemirror is destroyed
- make Editor subcomponents communicate through the Editor Controller
- Set Codemirror and html preview shared scrolling
- Set CodeMirror, html preview css scroll class with util
- Create 'scratch' property in Editor controller; prevents a model save wiping image markers due to markdown bindings
- Add editor and html preview actions to handle img upload start/finish
- disable codemirror when an image is being uploaded, enables on success or failure
- Fix editor wordcount when there are 0 words
- Add modal dialog when transitioning out of the editor with an unsaved post
- Add window.onbeforeunload handling with `.unloadDirtyMessage()` on editor controller
- and various other things
Label 'for' attribute value literal have no delimiter.

Closes #2954
Merge pull request #2953 from novaugust/authenticate-ember-routes

Change `posts`, `post`, and `signout` routes to be `AuthenticatedRoute`s
Merge pull request #2955 from jasonsturges/attribute-delimiter

Label 'for' attribute value literal have no delimiter.
Merge pull request #2952 from novaugust/ember-signin-transition

Transition user to original destination on login
Merge pull request #2946 from halfdan/fix-page

Fixes static pages when permalinks are active.
Merge pull request #2895 from appleYaks/editor-parity

Reach Editor parity with Ember