Add emms to handle media
Delete extra whitespace, add new keybindings

Remove all the trailing whitespace from the file.  Add new keybindings
for scrolling up and down one line.  Instead of simply setting
{scroll,tool,menu}-bar-mode off, first check if they are bound, then
turn them off.
Before save hooks, emms, and kill region/word

Add before save hooks to delete all trailing whitespace, and to run
gofmt on go sources.  Swap kill-region and backward-kill-word keys.
Add volume control to emms and map play/pause, next, and previous
media keys to emms commands.