Log Message:
Update ruby-rspec-rails to 3.4.2.

### 3.4.2 / 2016-02-02
[Full Changelog](http://github.com/rspec/rspec-rails/compare/v3.4.1...v3.4.2)

Bug fixes:

* Cache template resolvers during path lookup to prevent performance
  regression from #1535. (Andrew White, #1544)

### 3.4.1 / 2016-01-25
[Full Changelog](http://github.com/rspec/rspec-rails/compare/v3.4.0...v3.4.1)

Bug Fixes:

* Fix no method error when rendering templates with explicit `:file`
  parameters for Rails version `4.2.5.1`. (Andrew White, Sam Phippen, #1535)