Log Message:
Update ruby-hashie to 3.4.3.

## 3.4.3 (10/25/2015)

* [#314](https://github.com/intridea/hashie/pull/314): Added a
  `StrictKeyAccess` extension that will raise an error whenever a key is
  accessed that does not exist in the hash -
  [@pboling](https://github.com/pboling).

* [#304](https://github.com/intridea/hashie/pull/304): Ensured compatibility
  of `Hash` extensions with singleton objects -
  [@regexident](https://github.com/regexident).

* [#306](https://github.com/intridea/hashie/pull/306): Added
  `Hashie::Extensions::Dash::Coercion` -
  [@marshall-lee](https://github.com/marshall-lee).

* [#310](https://github.com/intridea/hashie/pull/310): Fixed
  `Hashie::Extensions::SafeAssignment` bug with private methods -
  [@marshall-lee](https://github.com/marshall-lee).

* [#313](https://github.com/intridea/hashie/pull/313): Restrict pending spec
  to only Ruby versions 2.2.0-2.2.2 - [@pboling](https://github.com/pboling).

* [#315](https://github.com/intridea/hashie/pull/315): Default `bin/` scripts:
  `console` and `setup` - [@pboling](https://github.com/pboling).