Add remaining GuidedTour engineers and designers to author list

* Remove separate author list for file (avoiding duplicate
maintenence work).

* Update version to 2.0.  It was 1.0 since the beginning, then it was
updated to 1.1.0 for the i18n format change (1109f6a1a).

I think the new API (fc9de92a6) merits an update, and why not a major
version?

Change-Id: Iecde3787d9f7cecfb1c26a37018ce6d0fb6a97a2