Create/Edit/Delete Timelines in Authoring Tool.

Added a new Authoring Tool panel on the bottom of the ChronoZoom page. Two buttons are available for using: "create timeline" and "edit timeline".

More information here:
https://trello.com/c/lhCGFll1

Specification document:
https://www.dropbox.com/s/n1100mccszavhnt/Timeline%20Restrictions.pdf