Restlet2.1.6发布，修正ObjectRepresentation的构造函数问题
OneCoder在Restlet 2.1.4中 匪夷所思的ObjectRepresentation的构造函数中，提到过在使用2.1.4的时候遇到的异常
Exception in thread "main" java.lang.IllegalArgumentException : The serialized representation must have this media type: application/x-java-serialized-object or this one: application/x-java-serialized-object+xml
at org.restlet.representation.ObjectRepresentation.<init>(ObjectRepresentation.java:203)
at org.restlet.representation.ObjectRepresentation.<init>(ObjectRepresentation.java:114)
当时结果阅读代码，认为是Restlet的一个bug，并提交给Restlet。得到回复确认，称将在2.1.6版本中修复：
Hello,
thansk a lot for reporting this issue which is clearly a regression. I've added a ticket for that point: https://github.com/restlet/restlet-framework-java/issues/809
The fix will be part of the 2.1.6 release, available in a few minutes.
Best regards,
Thierry Boileau
今天想起，登录了一下Restlet的官方，发现最新版已经是2.1.6了。查看了一些change log，发现该问题确实已经解决。
===========
Changes log
===========
- 2.1.6 (12/05/2013)
- Bug fixed
- Fixed issue #809 regression introduced when handling issues #774 and #778.
不过OneCoder还没有升级测试。大家可以测试一下。
所有代码已上传至Github：https://github.com/lihongzheshuai/yummy-code
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