.gitmodules: Remove Plugin prefix from module name

Configure git to store submodule 'clone' in .git/modules/Submodule
instead of .git/modules/Plugin/Submodule.  In the future, We can
then move them easily from:

	./Plugin/Ckeditor -> ./Ckeditor

by updating the 'path' key in .gitmodules file
Upgrade submodule to croogo/Ckeditor@ce5f40b
Acl: Prevent infinite redirect

When 'Role-registered' tries to login in admin area, they will get
redirected to /admin/users/users/index
Acl: Updating docblocks
Merge branch '1.5-acl' into 1.5