Regression testing: cairo mock object stores graphics calls

So the idea behind this is maintain an "expected value" for the sample runs. We store the graphics calls and their arguments as a readable text file. Any change in the samples will break this, but the idea is to make sure this doesn't get broken unexpectedly.

Rearranged the data files in specs

spec/commands/new_spec.rb

@@ -26,7 +26,7 @@ describe  Squib::Commands::New do
     end
 
     it 'creates a new template on an empty directory' do
-      Dir.mkdir('foo')
+      FileUtils.mkdir_p('foo')
       @cmd.process(['foo'])
       expect(File.exists?('foo/deck.rb')).to be true
     end