BUGFIX: file_glob should use relative path.

Given a templer input-file which contains "`file_glob( "foo*.jpg" )`"
we expect the input to be just foo1.jpg, when calling Image::Size
because we've already run a `chdir`.

In short wihtout this change image-sizes are not calculated correctly
because the image doesn't exist.
WARN on Image::Size failures.
  Perltidy.
  New release.