mybatis / redis-cache / 122

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Resolved problems mentioned in last discussion with kryo serializer (#61)

* Fix unserialize bug when web application restart.
The situation as as following:
Start redis-server
1. Start web application.
2. Execute query and some objects are cached. -> Class is registered
3. Stop web application.
4. Start web application. 
5. KryoSerializer is initialized and no Class is registered yet.
6. Execute theKryoSerializer#unserialize() is invoked, but it fails
because Class is unknown.

* Modify effection problem when switch between kryo serializer and jdk
serializer in situation that certain class can not serialize with kryo
serializer(very rare)

* Abstract serializers to an interface in order to support various
serialize methods.

* Set kryo dependency to optional

* Add serializer interface

* Use JDKSerializer as fallback of KryoSerializer and add related
testcases.

* Make serializer configurable with redis.properties

* Add test case of unserialize object from a file

* Fix test NPE bug in JDK9

* Format java files and set default serializer to jdk.

* Fix test case bug of unserialize with kyro from file.

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