Add antialias config option

Closes #41

benchmarks/antialias_best.rb

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+require 'squib'
+
+Squib::Deck.new(cards: 200, config: 'antialias_best.yml') do
+  background color: :white
+  # alphabet = 'a'.upto('z').to_a.join + ' ' + 'A'.upto('Z').to_a.join + ' '
+  # text       str: alphabet * 36 , font: 'Sans Bold 18', width: 825, height: 1125, hint: :red
+  0.upto(500).each do |i|
+    circle radius: 50,
+           x: (i % 17) * 50,
+           y: (i / 17) * 50
+  end
+  save_png   prefix: 'antialias_best_'
+end

benchmarks/antialias_best.yml

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+antialias: best

benchmarks/antialias_fast.rb

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+require 'squib'
+
+Squib::Deck.new(cards: 200, config: 'antialias_fast.yml') do
+  background color: :white
+  # alphabet = 'a'.upto('z').to_a.join + ' ' + 'A'.upto('Z').to_a.join + ' '
+  # text       str: alphabet * 36 , font: 'Sans Bold 18', width: 825, height: 1125, hint: :red
+   0.upto(500).each do |i|
+    circle radius: 50,
+           x: (i % 17) * 50,
+           y: (i / 17) * 50
+  end
+  save_png   prefix: 'antialias_fast_'
+end

benchmarks/antialias_fast.yml

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+antialias: fast