[chef] omnitruck/install.sh deployment

[Lamont Granquist < >]

omnitruck and install.sh just got a minor version release that should 
not affect anyone:

- added endpoints and a -P chefdk option to install.sh for upcoming chefdk

  (there are no artifacts yet to download so -P chefdk should 404 -- 
don't send us tickets, we're aware its not live yet)

- MacOSX .dmg support

  (again, no .dmg artifacts have been published, so .pkgs will still be 
downloaded and installed for chef-client on Mac)

- support for -n nightly releases

  (i don't think we have any of these published yet, so again this will 
probably just 404 if you try to use it -- at best you'll find some
   ancient nightly-stamped version of chef that someone uploaded a long 
time ago...)

- smartos detection in install.sh

  (and we have no built smartos artifacts, this is only the install.sh 
platform detection bit, so again it'll 404 if you try to use it)

so...  mostly this is pretty useless to you all today and just sets the 
foundation for future goodness, and hopefully this incremental change
does not break anyone...