#109: Confirmation message on node delete added.
#109: Button title "ADD NODE+" changed to "EDIT".
#109: Disable node dragging, allow only node edit / delete.
Dev commit (settings added to sitemap view model).
Fix for node dropping.
#110: Each node separate saving disabled.
Changes for #110:
 - Globalization updated.
 - Unused function removed.
 - isDeleted property added to node view model.
 - Save / Cancel buttons added to Edit and Add New Page dialogs.
 - Sitemap saving function calling added.
#118: css updated.
#110: sitemap editing refactored.
#110: node ordering fixed after custom link adding.
#110: sitemap reload updated and test comment removed.
#110: sitemap saving updated (server side).
#110: style updated.
#110: style fix (hover on page links).
#111: implemented:
- Disable node dragging, editing and deleting.
- Allow to drag page on the sitemap only one time.
- Implement Undo after page drop.
- Change Skip button to Undo after page is placed.
- Add Save / Cancel buttons to the dialog.
Merge branch 'dev-sitemap' into dev
Merge remote-tracking branch 'remotes/origin/dev' into dev-content-history
Implement server side widget history logic. Closes #15.