Growl installatinos and updates work again.
Growl installatinos and updates work again.

According to NSFileManager's documentation for -[NSFileManager createDirectoryAtPath:attributes]:
"The directory to be created must not yet exist, but its parent directory must exist."

We now create the GrowlInstallations directory before creating GrowlInstallations/`uuidgen` (within NSTemporaryDirectory).

--HG--
extra : convert_revision : svn%3A99687598-2e92-11dd-8019-fe7b9d601d1b/trunk%401732

incbee/Growl,PersonifyInc/growl,incbee/Growl,incbee/Growl,PersonifyInc/growl,PersonifyInc/growl,incbee/Growl,PersonifyInc/growl,incbee/Growl,PersonifyInc/growl