yaml | for here strings

From http://yaml4r.sourceforge.net/doc/

Multi-line types

Strings which span several lines can be represented in YAML as blocks. Blocks begin with either a literal '|' character or a folded '>' character. The block is then dumped into a new level of indentation:

- literal: |
    A literal block keeps all
    new lines when it is brought
    into Ruby.
- folded: >
    A folded block will get rid
    of its newlines, trading them
    for spaces when it is brought
    into Ruby.