Log Message:
Update ruby-rspec-expectations to 3.2.1.

### 3.2.1 / 2015-04-06
[Full Changelog](http://github.com/rspec/rspec-expectations/compare/v3.2.0...v3.2.1)

Bug Fixes:

* Prevent `Range`s from being enumerated when generating matcher
  descriptions. (Jon Rowe, #755)
* Ensure exception messages are compared as strings in the `raise_error`
  matcher. (Jon Rowe, #755)