Close the log tmpfile so that it is removed

Fixes a problem with leftover tempfiles under /tmp. The tempfile is not
automatically deleted if the close() method of NamedTemporaryFile is not
called.

Change-Id: I30d47e9bd35d74704c448227c744ff4e766791bd
Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
Document and release version 0.6

Change-Id: I70c04eab33f9347167b768869306efa90232d2cc
Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>