Added slow paste command and rdesktop

Iceweasel doesn't like fast repetition of characters if they're input
via normal input rather than paste, so I've created a slow-paste
function which will sleep between each character paste for instances
where I still want to use my universal paste in Iceweasel. Still need to
map this to work automatically if current window is Iceweasel.

Also made a slightly more useful rdesktop command which will
automatically size to one of my screens.

TODO: Automatically choose paste type based on window, automatically
send rdesktop instances to their own window group, automatically send
java stuff to floating window group.