Fixes suggested by Curtis
Merge pull request #438 from hflynn/permissions_dev

Permissions develop
Merge pull request #434 from hflynn/tiff_rework

Data Model & OME-TIFF Docs rework
merge develop -D org -I include -E exclude: PR 369 (Cpp: Correct content and markup)
merge develop -D org -I include -E exclude: PR 439 (Brew install develop)