Automatically append `select_all: true` to DOM-Method DSL

[marcoroth]

The idea of the methods in the "DOM-Method" DSL is to potentially query multiple DOM nodes. With that it would make sense if dom, selector and css would automatically append the option select_all: true.

cable_ready-dsl/lib/cable_ready/dsl/method_dsl.rb

Lines 6 to 16 in 275d655

	def dom(selector)
	::CableReady::Dsl::SelectorString.new(selector)
	end
	def selector(selector)
	dom(selector)
	end
	def css(selector)
	dom(selector)
	end

Maybe also a css_classes method would make sense. The select_all: true would also apply for that.