Color handling handed off to rcairo

lib/squib/api/background.rb

@@ -2,8 +2,9 @@ module Squib
   class Deck
     #module API
 
-      def background(range: :all, color: '#000000')
+      def background(range: :all, color: :black)
         range = rangeify(range)
+        color = colorify(color)
         range.each { |i| @cards[i].background(color) }
       end
       

lib/squib/api/text.rb

@@ -17,8 +17,9 @@ module Squib
       range = rangeify(range)
       str = [str] * @cards.size unless str.respond_to? :each
       font = fontify(font)
+      color = colorify(options[:color])
       range.each do |i|
-        cards[i].text(str[i], font, x, y, options)
+        cards[i].text(str[i], font, x, y, color, options)
       end
     end