Modify OSX :package in Rakefile to allow pkg/ and dmg/ to be
placed outside the Shoes3.2 directory. Like to a real disk
and not the NFS mounted shoes3.2. Speeds things up.
Also changed the package name from 'shoes' to 'shoes-federales'
for OSX.
Rakefile: OSX: Allow dist/ to be outside the source directory
  Sets and uses TGT_DIR -- an unfortunate constant I've use
  in 3.2 rakefiles. Build_directory (BDIRP) would be better but
  all the linux and msw rakefiles use TGT_DIR.

  This speeds up my weird NFS builds if NFS_ALTP is set in shell.
  and should be harmless on a real mac with a git clone of Federales.