Add spec tests for checking that the thumbnail strip option works
Add dragonfly image strip process for compatibility
Conflicts:
	images/lib/refinery/images/dragonfly.rb
Add missing changelog entries.

Conflicts:
	changelog.md
Add release date for 2.1.2.
update the extending models guide for rails 4 and strong paramaters

make background image code format

instead of overwriting the page_params method, recommend using
alias_method_chain
Update 1 - Menu Presenter.textile

Spelling mistake