a start on conditionals

lib/vool/statements.rb

@@ -4,6 +4,15 @@ module Vool
     def initialize(statements)
       @statements = statements
     end
+    def empty?
+      @statements.empty?
+    end
+    def single?
+      @statements.length == 1
+    end
+    def first
+      @statements.first
+    end
   end
 
   class ScopeStatement < Statements