Change DB backup location

closes #2887
- Stores content files under /content/data/
Transition to editor.edit after saving a new post

Closes #2860
- `editor-base-controller`'s `save` action returns a promise with the model
  after saving
- `EditorNewController` will transition to `EditorEditController` upon a
  successful save (model has an id)
- Removed a console.log in editor's save function
Fix typo in code comment: propogation errata changed to propagation.
Merge pull request #2930 from novaugust/save-new-post-transition

Add transition to editor/:id upon saving new post
Convert support links from forum to new support site
Merge pull request #2942 from JohnONolan/support-dot-ghost

Convert support links from forum to new support site
Merge pull request #2939 from jomahoney/db-backup

Change DB backup location
Merge pull request #2941 from jasonsturges/errata

Fix typo in code comment: propogation errata changed to propagation.