Revision history for String-JS
0.03    2016-03-11 (PERLANCAR)
        - Replace JSON with JSON::MaybeXS.
0.02    2014-07-25 (SHARYANTO)
        - Add $mode option to encode_js_string() which can be set to 1 to
          produce single-quoted JS string literal, or 2 to produce single-quoted
          inside double-quoted JS string literal.
0.01    2014-07-25 (SHARYANTO)
        - First release.