[apache/incubator-dubbo] Merge incubator-dubbo-rpc-jsonrpc into incubator-dubbo

[徐靖峰]

Hi

I want to Merge 
incubator-dubbo-rpc-jsonrpc(https://github.com/apache/incubator-dubbo-rpc-jsonrpc
 <https://github.com/apache/incubator-dubbo-rpc-jsonrpc>) into incubator-dubbo. 
Package name and author information will be refactored.