Adding custom edition image.

Added new custom edition image, custom-edition-image.

A custom field type will need to be set up on the WordPress  need to be set up on the spiderWebShow WordPress backend proper - which I'm happy to do (could you set me up with an account on there?).

Is called as follows: ```<?php echo types_render_field( "custom-edition-image", array(  )  ) ?>```

Currently has minimal (read: no) additional styling added to it