Dubbo with Erlang language implementation.

[谢生校]

Hi !
        I implemented Dubbo With Erlang language. It has most of the main 
features of Dubbo.  
        I want to add it to Dubbo language list, so i create  a pull request.
        Project Url: https://github.com/dubboerl/dubboerl 
<https://github.com/dubboerl/dubboerl>
        Pull Request: https://github.com/apache/incubator-dubbo/pull/3898 
<https://github.com/apache/incubator-dubbo/pull/3898>

        I hope you can give some advice.

Thank you!