def post_entry(title = '', content = '', categories = [], draft = 'no')
      entry_xml = entry_xml(title, content, categories, draft)
      response = post(entry_xml)
      Entry.load_xml(response.body)
    end
def post_entry(title = '', content = '', categories = [], draft = 'no')
      entry_xml = entry_xml(title, content, categories, draft)
      response = post(entry_xml)
      Entry.load_xml(response.body)
    end
Post a blog entry.
 @param [String] title entry title
 @param [String] content entry content
 @param [Array] categories entry categories
 @param [String] draft this entry is draft if 'yes', otherwise it is not draft
 @return [Hatenablog::BlogEntry] posted entry