extract_file_contents accept extra arguments
extract_file_contents accept extra arguments

so that it may be used to extract content in textual format, instead of using XML, for example
sgaist/django-haystack,celerityweb/django-haystack,sgaist/django-haystack,sgaist/django-haystack,celerityweb/django-haystack,celerityweb/django-haystack