implemented parent() method
implemented matches() node method
Merge branch 'parent' into new_methods

Conflicts:
	lib/HTML/TreeBuilder/LibXML/Node.pm
modified parse_file() to read file, then call parse_content()
implemented content_list() node method
implemented delete_content() node method
implemented push_content() node method
fixed push_content()
implemented clone_list() node method
implemented preinsert() and postinsert()
implemented unshift_content() node method
implemented replace_with() node method
implemented detach() node method
fixed replace_with(), now creating new document for the replaced node
implemented disembowel() method