Removed user perspectivev3 file in xcode project and update the gitconfig

Removed user perspectivev3 file in xcode project and update the gitconfig

gitconfig in src/platform/DARWIN/AFSPreference has been modified to ignore the perspectivev3 that is created by xcode for window layout.Has been also delete the file created for the user

Reviewed-on: http://gerrit.openafs.org/267
Tested-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 20243612a15b150a3dbb3c9e027c1c79a0e5f200)
Change-Id: Ia662362eaa7a14c56bd558e9d03b98eaa1934f50
Reviewed-on: http://gerrit.openafs.org/950