add some helper methods to assist in setting up nests when super resources just can't cut it

for example, when a polymorphic nesting crosses engine boundaries
add some helper methods to assist in setting up nests when super resources just can't cut it

for example, when a polymorphic nesting crosses engine boundaries
Merge branch 'ratjens' of github.com:marketboomer/nunchaku into ratjens

Conflicts:
	app/controllers/concerns/nunchaku/resources.rb
Merge pull request #30 from marketboomer/ratjens

add some helper methods to assist in setting up nests when super resources just can't cut it