Improvements to the clock command

[mckennajones]

I really enjoy the clock command but because of it's implementation it has some things that are a bit annoying. First, it would be nice to have a command to remove the clock. Currently the only way is to kill the process manually or by killing the terminal window. Also, since it uses the tput command, it is not possible to scroll on your terminal, because it is constantly refreshing. Just some thoughts.

Great little app btw!

[adtac]

@mckennajones I've added an option to remove the clock in 3dbc88f (it's quite hacky, but it does the job :P).

About the tput method, I'm not aware of anyway to write to a particular line without it. Any ideas anybody?