[#530] authz docs take 1
[#530] remove publisher profile doc
[#530] Reformat
[#530] Remove org & groups old info
[#530] Improve readability
[#530] Reformat member types
[#530] Use versionchanged in auth docs
[#530] Clarify opening paragraph in auth docs
[#530] Amendments recommended in review
[#530] Edit authorization docs

Just editing for clarity, especially in exactly what org admins, editors
and members can do, and what the config options do.
[#530] Document difference between sysadmin and org admin
[#530] Add intro para to orgs docs
[#530] Auth doc updates
Merge branch '530-auth-docs' of github.com:okfn/ckan into 530-auth-docs

Conflicts:
	doc/authorization.rst
[#530] Auth doc updates
[#530] Edit authorization docs

Minor edits
Merge branch '530-auth-docs'