add also calls on classes and more tests for that

lib/parser/call_site.rb

@@ -9,7 +9,8 @@ module Parser
           space? >> right_parenthesis
     }
 
-    rule(:call_site) { (name.as(:receiver) >> str(".")).repeat(0,1) >> name.as(:call_site) >> argument_list >> comment.maybe}
+    rule(:call_site) { ((module_name|name).as(:receiver) >> str(".")).maybe >> #possibly qualified
+                          name.as(:call_site) >> argument_list >> comment.maybe}
 
     
   end

lib/parser/transform.rb

@@ -23,7 +23,11 @@ module Parser
 
     rule( :call_site => simple(:call_site), 
           :argument_list    => sequence(:argument_list)) do
-           Ast::CallSiteExpression.new(call_site.name, argument_list) 
+           Ast::CallSiteExpression.new(call_site.name, argument_list )
+    end
+    rule( :receiver => simple(:receiver) , :call_site => simple(:call_site), 
+          :argument_list    => sequence(:argument_list)) do
+           Ast::CallSiteExpression.new(call_site.name, argument_list , receiver) 
     end
 
     rule(:if => simple(:if), :conditional     => simple(:conditional),