handle non-utf8 encoded XML files

gistfile1.js

      case S.PROC_INST_ENDING:
        if (c === ">") {
          emitNode(parser, "onprocessinginstruction", {
            name : parser.procInstName,
            body : parser.procInstBody
          })
          if (parser.procInstName === "xml") {
              var match = parser.procInstBody.match(/encoding\s*=\s*['"]([A-Za-z_0-9-]+)['"]/)
              if (match) parser.encoding = match[1]
          }
          parser.procInstName = parser.procInstBody = ""
          parser.state = S.TEXT
        } else {
          parser.procInstBody += "?" + c
          parser.state = S.PROC_INST_BODY
        }
      continue