Log Message:
Update ruby-rspec-expectations to 3.4.0.

### 3.4.0 / 2015-11-11
[Full Changelog](http://github.com/rspec/rspec-expectations/compare/v3.3.1...v3.4.0)

Enhancements:

* Warn when `RSpec::Matchers` is included in a superclass after it has
  already been included in a subclass on MRI 1.9, since that situation
  can cause uses of `super` to trigger infinite recursion. (Myron Marston, #816)
* Stop rescuing `NoMemoryError`, `SignalExcepetion`, `Interrupt` and
  `SystemExit`. It is dangerous to interfere with these. (Myron Marston, #845)
* Add `#with_captures` to the
  [match \ 
matcher](https://www.relishapp.com/rspec/rspec-expectations/docs/built-in-matchers/match-matcher)
  which allows a user to specify expected captures when matching a regex
  against a string. (Sam Phippen, #848)
* Always print compound failure messages in the multi-line form. Trying
  to print it all on a single line didn't read very well. (Myron Marston, #859)

Bug Fixes:

* Fix failure message from dynamic predicate matchers when the object
  does not respond to the predicate so that it is inspected rather
  than relying upon it's `to_s` -- that way for `nil`, `"nil"` is
  printed rather than an empty string. (Myron Marston, #841)
* Fix SystemStackError raised when diffing an Enumerable object
  whose `#each` includes the object itself. (Yuji Nakayama, #857)