Old versions of some libraries in HP 2013.2

[Mikhail Glushenkov]

Hi Mark,

I noticed that we're not using the latest versions of some libraries
in the 2013.2 spec:

zlib: 0.5.4.0 (latest: 0.5.4.1)
case-insensitive: 1.0.0.1 (latest: 1.0.0.2)
unordered-containers: 0.2.3.0 (latest: 0.2.3.1)

Is there some reason for that?

We're also using old versions of hashable and cgi, but in that case I
know the reasons (dependency on MonadCatchIO-mtl and SipHash,
respectively).

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