Read given_file to self.contents
        Will ignoring duplicate lines if self.unique is True
        Will sort self.contents after reading file if self.sorted is True

def read(self, given_file):
        """
        Read given_file to self.contents
        Will ignoring duplicate lines if self.unique is True
        Will sort self.contents after reading file if self.sorted is True
        """
        if self.unique is not False and self.unique is not True:
            raise AttributeError("Attribute 'unique' is not True or False.")
        self.filename = str.strip(given_file)
        self.log('Read-only opening {0}'.format(self.filename))
        with open(self.filename, 'r') as handle:
            for line in handle:
                line = line.rstrip('\r\n')
                if line is None:
                    line = ''  # Blank lines that were just \n become None so convert them to empty string.
                if self.unique is False or line not in self.contents:
                    self.contents.append(line)
        if self.sorted:
            self.sort()
        self.log('Read {0} lines.'.format(len(self.contents)))
        return True