Get all unique links in the html of the page source.
            Page links include those obtained from:
            "a"->"href", "img"->"src", "link"->"href", and "script"->"src".

def get_unique_links(self):
        """ Get all unique links in the html of the page source.
            Page links include those obtained from:
            "a"->"href", "img"->"src", "link"->"href", and "script"->"src". """
        page_url = self.get_current_url()
        soup = self.get_beautiful_soup(self.get_page_source())
        links = page_utils._get_unique_links(page_url, soup)
        return links