Admins of ctnrs can now edit ctnrs without having to change their current ctnr
Refactor suggested by @zeeman
Pep8 formatting
Merge branch 'Ctnr_Detail_View_Perms' of https://github.com/church29/cyder into church29-Ctnr_Detail_View_Perms

Conflicts:
	cyder/core/ctnr/views.py
Merge branch 'church29-Ctnr_Detail_View_Perms'