add use_recaptcha configuration option
check recaptcha in create action if Inquiries.use_recaptcha is true
add recaptcha_tags to inquiry form if use_recaptcha is true
Merge branch '2-0-stable' into recaptcha
Merge branch 'recaptcha' into 2-1-stable

Conflicts:
	lib/generators/refinery/inquiries/templates/config/initializers/refinery/inquiries.rb.erb