Remove duplicate posts and tags on import

Issue #806

- Modify sanitize to check for duplicate posts and tags
- Update posts_tags when referencing removed duplicate tags
- Return both data and problems from importData
- Add tests for duplicate posts and tags with fixtures
Created image helper with absolute url option

closes #4231

- Adds {{image}} helper
- Adds image_spec test unit
- Updated {{ghost_head}} to use image helper
Editor must be focused before allowing certain keyboard shortcuts.

closes #4253
- checked for the CodeMirror-focused class on the CodeMirror div
- used length to determine whether CodeMirror-focused has been added
- determines whether the editor has been focused on
Merge pull request #4155 from jgable/importDuplicates

Remove duplicate posts and tags on import
Merge pull request #4317 from cobbspur/image

Created image helper with absolute url option
Merge pull request #4375 from DaveRobson/#4253

Editor must be focused before allowing certain keyboard shortcuts.
Create Tags Management Stubs for Ember

closes #4260

- Adds "tags" route inside of the settings routes.
- Adds this route to router.js
- Links the route from the settings.hbs template
- Adds demo tags html in tag.hbs template
- Adds flag for tagsUI