Implement Into<cookie::Cookie> for Cookie

[dlrobertson]

This is largely for servo/servo#10826.

Implement Into<cookie::Cookie> (where cookie is cookie-rs). Then impl Serialize and Deserialize in cookie-rs.

Either way, we need one common way of representing a cookie... As long as it isn't oatmeal raisin 😄

CC @asajeffrey

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This change is

[jgraham]

I am… not thrilled about requring serde here, at least unless you serdeify the whole crate. I think maybe implementing Into<Cookie> would be better if that will give you what you need.

[asajeffrey]

IRC converation: http://logs.glob.uno/?c=mozilla%23servo&s=27+May+2016&e=27+May+2016#c442197

[dlrobertson]

Updated

[jgraham]

Reviewed 2 of 3 files at r2.
Review status: 2 of 3 files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[jgraham]

Reviewed 1 of 3 files at r2.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable