[mongoose] Release 3.8.21

3.8.21 / 2014-12-18
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 * fixed; syntax in index.jade #2517 [elderbas](https://github.com/elderbas)
 * fixed; writable statics #2510 #2528
 * fixed; overwrite and explicit $set casting #2515

New Bugs

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Please report any issues if they do not already exist:

https://github.com/learnboost/mongoose/issues/new

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