when checking permission on "get_object" views, several properties need to be definied ahead of time
making object permission check make sure that the view has an "object" before trying to "get" it
making object permission check make sure that the view has an "object" before trying to "get" it

Conflicts:
	guardian/mixins.py
adding test to cover case for when a single object view has no object assigned or get_object return value
adding self to authors file as requested
Merge branch 'fix_object_check' of github.com:ephemerallabs/django-guardian into fix_object_check
reverting to code from master as it was good
Merged object get at view
Merged changes from Greg