Correct the automatic test report build

[kabirkbr]

While docs/public is included into .gitignore, it is somehow becomes tracked by git after Travis pushes it into repo at the end of the build cycle. Need to deal with this somehow otherwise too many html files get included into commits which is not necessary.

[kabirkbr]

Also, it seems that old links work and point to the old documetnation -- which means that the old files are not deleted when new documentation is compiled (see e.g Travis builds 88 and 87...). This is not good -- a new documentation push should completely wipe out an old one.