pre blocks not styled in 0.7.0+

[sunaku]

Ronn 0.6.6 has very nice styling for pre blocks: background: #EDECEB; border-left: 1ex solid #DDD; padding: 5px 1ex;

Newer versions removed this styling, making it harder to distinguish between prose and code examples (pre blocks).

Please revive the old pre styling!

[sunaku]

I restored the old pre styling in my fork at sunaku/ronn@8744469fb9b919b74f6bbaa5e9dd3342f5d26c5c