Bump underscore from 1.9.1 to 1.9.2

Bumps [underscore](https://github.com/jashkenas/underscore) from 1.9.1 to 1.9.2.
- [Release notes](https://github.com/jashkenas/underscore/releases)
- [Commits](https://github.com/jashkenas/underscore/compare/1.9.1...1.9.2

)

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