added 3 more options

[muellmatto]

1. default image rendition
2. skip bleaching
3. dont wrap images in anchor tags

[zerolab]

@muellmatto thank you for this.
Two things:

1. Drop the unsafe_html setting/logic. I'd rather not provide the gun for people to shoot their feet with
2. Can you add some tests for the default image rendition, and skipping anchors around images?

[muellmatto]

Hi, thank you for your feedback.
I agree with your first point, i was too lazy to configure allowed_tags.
I will try to provide some tests soon.