Allow new-lines in Method descriptions

[weierophinney]

The descriptions of Methods (ex. POST, GET, etc.) can have new-lines on data-entry, but the new-lines are ignored in this Documentaiton module.

As it stands right now, new-lines are, effectively, just spaces. This can make the description of a given method more more difficult to read when there is more than a few sentences.

See the screen-shot for an example of the desired effect: I have included the CSS ( white-space: pre ) on the related element.

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Originally posted by @dmalouf at zfcampus/zf-apigility-documentation#42