Media image formatter

This is an image formatter for Media's "Multimedia asset" field. It is based on a core Image formatter. It works just like the latter one, except the fact, that can operate with media field type.

This formatter is much simpler in comparison to Media's default formatter. The only disadvandtage is, that it only knows how to operate with images. If some other file type will be added to a field, it will be simply ignored.