Indicate which buffer is selected in the buffer list.

Does not indicate if a network status buffer is selected as [data-buffer-id] is attached to the .network-name. Not sure if I should add `.selected` to `.network` or `.network .network-name`.

Renamed .active in the LESS (which was probably meant for this?) to .channel.selected as .active is used in bootstrap.

![](http://i.imgur.com/6Gf9BKC.png)