Update ruby-rspec-expectations to 2.11.2.

### 2.11.2 / 2012-07-25
[full changelog](http://github.com/rspec/rspec-expectations/compare/v2.11.1...v2.11.2)

Bug fixes

* Define `should` and `should_not` on `Object` rather than `BasicObject`
  on MacRuby. On MacRuby, `BasicObject` is defined but is not the root
  of the object hierarchy. (Gabriel Gilder)

### 2.11.1 / 2012-07-08
[full changelog](http://github.com/rspec/rspec-expectations/compare/v2.11.0...v2.11.1)

Bug fixes

* Constrain `actual` in `be_within` matcher to values that respond to `-` instead
  of requiring a specific type.
    * `Time`, for example, is a legit alternative.

### 2.11.0 / 2012-07-07
[full changelog](http://github.com/rspec/rspec-expectations/compare/v2.10.0...v2.11.0)

Enhancements

* Expand `expect` syntax so that it supports expections on bare values
  in addition to blocks (Myron Marston).
* Add configuration options to control available expectation syntaxes
  (Myron Marston):
  * `RSpec.configuration.expect_with(:rspec) { |c| c.syntax = :expect }`
  * `RSpec.configuration.expect_with(:rspec) { |c| c.syntax = :should }`
  * `RSpec.configuration.expect_with(:rspec) { |c| c.syntax = [:should, :expect] }`
  * `RSpec.configuration.add_should_and_should_not_to Delegator`

Bug fixes

* Allow only `Numeric` values to be the "actual" in the `be_within` matcher.
  This prevents confusing error messages. (Su Zhang @zhangsu)
* Define `should` and `should_not` on `BasicObject` rather than `Kernel`
  on 1.9. This makes `should` and `should_not` work properly with
  `BasicObject`-subclassed proxy objects like `Delegator`. (Myron
  Marston)

(taca)