Bump up layer priority to 8 so meta-gumstix-extras can override meta-gumstix  (priority=7) if necessary
Disable Perl bindings on xfconf as it fails to link.

During compile, some users see errors from the linker:
 /usr/bin/ld: cannot find -ldbus-glib-1
 ...
As these only occur when compiling the perl bindings, this patch disables
them.
Merge branch 'dylan' of git://github.com/gumstix/meta-gumstix-extras into dylan