Fix errors while request + XML::LibXML=>XML::Simple + more

1. XML::LibXML => XML::Simple 
    Cause while have several type_ids in request LibXML concat type_ids while find values like '//marketstat/type/ @id'
   Also XML::Simple more lightweight and faster than XML::LibXML

2. ignore urlencode while generate path to marketstat. I got a error unless delete urlencode. 
   Also in request we have only digital values

3. Correcting test cause XML::LibXML => XML::Simple 

4. $response = $self->ua->get($request); =>  $response = $self->ua->get($request->url->as_string);
   Cause get don't understand URI object.