fix bug: JS error when pdf contained single quotes in its name; add myself in AUTHORS as kindly request by Lu

AUTHORS

@@ -7,6 +7,7 @@ Hongliang Tian <tatetian@gmail.com>
 John Hewson <john@jahewson.com>
 Lu Wang <coolwanglu@gmail.com>
 Ryan Morlok <ryan.morlok@morlok.com>
+Michele Redolfi <michele@tecnicaict.com>
 
 Packagers:
 Arthur Titeica <arthur.titeica@gmail.com>

src/util/encoding.cc

@@ -135,6 +135,7 @@ void outputJSON(ostream & out, const string & s)
         {
             case '\\': out << "\\\\"; break;
             case '"': out << "\\\""; break;
+            case '\'': out << "\\\'"; break;
             case '/': out << "\\/"; break;
             case '\b': out << "\\b"; break;
             case '\f': out << "\\f"; break;