Fix color handling with text outline stroking

Needed to set squibcolor prior to translating the coordinate system so that gradients are relative to the card (as is documented). This also means stroking is done AFTER drawing the text, which looks better anyway.

samples/text_options.rb

@@ -79,7 +79,7 @@ Squib::Deck.new(width: 825, height: 1125, cards: 3) do
   end
 
   text str: "Stroke n <span fgcolor=\"\#ff0000\">fill</span>",
-       color: :green, stroke_width: 3.0, stroke_color: :blue,
+       color: :green, stroke_width: 2.0, stroke_color: :blue,
        x: '1.8in', y: '3in', width: '0.85in', font: 'Sans Bold 26', markup: true
 
   text str: "<b>Markup</b> is <i>quite</i> <s>'easy'</s> <span fgcolor=\"\#ff0000\">awesome</span>. Can't beat those \"smart\" 'quotes', now with 10--20% more en-dashes --- and em-dashes --- with explicit ellipses too...",