Release 3.8.39 (legacy) SECURITY FIX. Upgrade recommended.

[Valeri Karpov]

3.8.39 / 2016-01-15
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 * fixed; casting a number to a buffer #3764
 * fixed; enumerating virtual property with nested objects #3743 https://github.com/kusold

New Bugs
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Please report any issues if they do not already exist:
https://github.com/Automattic/mongoose/issues/new