Print config.log when build succeeded as well

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Remove extraneous comma

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Update cgal

Also adds a test for CGALImageIO.

Fixes #587.

Signed-off-by: Timothy Gu <timothygu99@gmail.com>