Specs for swipe events.

Some specs to back up the new swipe_up, swipe_down, swipe_left, and swipe_right events.

I added an extra test to show there are no collisions between swipe & swipe_*.   I doubt anyone will be bit by this, but me typing this out guarantees someone will now.

I also updated the readme.md but not the DocSet.  I have a feeling you may auto-generate that stuff.