move vool statements into own directory

also tests for guard to work

lib/vool/if_statement.rb

@@ -1,25 +0,0 @@
-module Vool
-  class IfStatement < Statement
-    attr_reader :condition , :if_true , :if_false
-
-    def initialize( cond , if_true , if_false = [])
-      @condition = cond
-      @if_true = if_true
-      @if_false = if_false
-      simplify_condition
-    end
-
-    def simplify_condition
-      return unless @condition.is_a?(ScopeStatement)
-      @condition = @condition.first if @condition.single?
-    end
-
-    def has_false?
-      @if_false != nil
-    end
-
-    def has_true?
-      @if_true != nil
-    end
-  end
-end