More exploration spikes

* Playing with PDF support
* Added background
* Added rectangle
* Split save to save_pdf and save_images since PDFs are way different
* Working on text rendering (non-pango for now, but that'll change)

bin/squib-eg

@@ -2,11 +2,19 @@
 require 'squib'
 
 deck width: 825, height: 1125, cards: 3
-
+background [1.0,1.0,1.0]
 data = {'name' => ['Thief', 'Grifter', 'Mastermind'], 
         'level' => [1,2,3]}
 
-text str: data['name'], x: 10, y: 250
-text str: data['level'], x: 10, y:10
+rect x: 0, y: 0, width: 825, height: 1125, x_radius: 30, y_radius: 30
 
-save format: :png
+
+text str: data['name'], x: 10, y: 250
+rect x: 10, y: 250, width: 100, height: 100
+
+text str: data['level'], x: 10, y: 15
+
+save format: :png
+save format: :pdf
+
+puts "Done!"