Add a scroller to channel list.

I read the issue #159 and thought it's a quite old and urgent issue.
I instantly code this patch and it seems it works nicely in my environment.
I used my scrollbar plugin, [perfect-scrollbar](https://github.com/noraesae/perfect-scrollbar) on this to make it look better(you know, the default scrollbar looks bad).

The pull request also contains a patch that changes my name in README and a minor bug patch.

Check if you like this work and if then I think @thedjpetersen (or I) can merge this.