Release 4.2.5 (stable)

[Valeri Karpov]

4.2.5 / 2015-11-09
==================
 * fixed; handle setting fields in pre update hooks with exec #3549
 * upgraded; ESLint #3547 https://github.com/ChristianMurphy
 * fixed; bluebird unhandled rejections with cast errors and .exec #3543
 * fixed; min/max validators handling undefined #3539
 * fixed; standalone mongos connections #3537
 * fixed; call `.toObject()` when setting a single nested doc #3535
 * fixed; single nested docs now have methods #3534
 * fixed; single nested docs with .create() #3533 #3521 https://github.com/tusbar
 * docs; deep populate docs #3528
 * fixed; deep populate schema ref handling #3507
 * upgraded; mongodb driver -> 2.0.48 for sort overflow issue #3493
 * docs; clarify default ids for discriminators #3482
 * fixed; properly support .update(doc) #3221

New Bugs
========

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

Release notes: https://github.com/LearnBoost/mongoose/wiki/4.0-Release-Notes
Migration guide: http://mongoosejs.com/docs/migration.html