New keyword Get Element Value implemented

[ilkkayli]

Returns element value based on element's name and index:

    def get_element_value(self, element, index):
    """
        Returns element value based on element's name and index.    
        Example:
        |${element_value} | Get Element Value | ${element_name} | ${index} |
        """

        value = element[int(index)].text
        print value

        return value