platypus 4.8: build launcher .apps for command-line utilities

Squashed commit of the following:

commit 452f771fadd30b35396ba5fca968e8567040906c
Author: Marnen Laibow-Koser <marnen@marnen.org>
Date:   Mon Sep 16 23:48:35 2013 -0400

    Remove redundant version number.

commit 71a2d16afdd574317147e8d0015d86f306eb0eca
Author: Marnen Laibow-Koser <marnen@marnen.org>
Date:   Mon Sep 16 23:47:25 2013 -0400

    Add caveats.

commit 26c4397a3c0835a3f3741e4e2ce5fbb311113fd8
Author: Marnen Laibow-Koser <marnen@marnen.org>
Date:   Mon Sep 16 23:44:00 2013 -0400

    Update Platypus formula.

commit 5bcd51340c90b4196747804166a743c3f5377493
Author: Martin Englund <martin@englund.nu>
Date:   Wed Nov 21 11:14:23 2012 -0800

    formula for platypus cli

    New formula for Platypus:
    http://sveinbjorn.org/platypus

    Note that this is for the cli only, which installs as 'platypus'.