Close #983 Better JSON.parse error detection

Previous pattern would only catch ILLEGAL, not { or other
known-but-unexpected JSON tokens.

lib/repl.js

@@ -184,8 +184,8 @@ function REPLServer(prompt, stream) {
           // It could also be an error from JSON.parse
           } else if (e &&
                      e.stack &&
-                     e.stack.match('Unexpected token ILLEGAL') &&
-                     e.stack.match(/Object.parse \(native\)/)) {
+                     e.stack.match(/^SyntaxError: Unexpected token .*\n/) &&
+                     e.stack.match(/\n    at Object.parse \(native\)\n/)) {
             throw e;
           }
         }