Gave up on a manpage install command, too

I would've liked to specify "manpages" as one of the arguments to the setup
function, but turns out that's not really possible.  The only alternative
would've been to hardcode docopts.1 as the file to install, which I didn't
like.
Better break these statements on their own lines
Implement NO_HELP
Implement unit tests
Move the note about version numbers here
Specify that NO_HELP must be set, don't require trailing whitespace in the example grep
Add travis file