docs and limit detection of model changes
returns empty string on no model changes
if response and url are empty, do nothing
Merge pull request #13 from FinalAngel/fixes/2788

if response and url are empty, do nothing
alignment and url check fix
Merge pull request #14 from FinalAngel/fixes/2788

alignment and url check fix
Merge branch 'develop' into fix-2788

Conflicts:
	cms/admin/pageadmin.py
fix tests
Merge branch 'develop' into fix-2788
Merge pull request #2807 from digi604/fix-2788

limit detection of model changes