Modify to receive speaker information from server

[yjaeseok]

Currently speaker information is provided hard coded data.
So If speaker information is changed, user need to update application.
For this reason, I modify to receive speaker information from server.

I am not sure, it is required feature or not.
But I think most gdg organizer want to use speaker data from server like this change list.
If you have any concern. please tell me.

[iampawan]

Hi, @yjaeseok thanks for the awesome PR. As you said all the information is hardcoded as of now. I am working on making it as much easy to customize as I can. Everyone is consuming data in a different way so I am trying to build something common. I am making a rest-client implementation as of now so that people like you can do network calls easily. Then I'll also add firebase to it. I hope you got my point.

[yjaeseok]

@iampawan Oh really, it sounds great for us.
I got your point, But I would like to contribute your source code more,
Because I am gdg organizer for preparing gdg devfest also :).
Could you give me some task for contributing your source?

[iampawan]

I will definitely let you know. For the time being, I'm pushing some changes to the repo in few mins. I would just like you to test it and give the feedback if that’s working fine.