Avoid be_true and be_false/be_falsy matchers 

* In RSpec 3, `be_false` and `be_true` are deprecated in favor of
  `be_falsey` and `be_truthy`
* Source: https://github.com/rspec/rspec-expectations/issues/283
* `be_falsy` works but is just an alias for `be_falsey` so we should prefer the
  latter
I tried to follow the pattern of other samples. If I remember correctly, the link works once merged. :)—
Sent from my phone

On Tue, Aug 5, 2014 at 5:26 PM, Harlow Ward <notifications@github.com>
wrote:

>>  
>>  [`expect` syntax]: http://myronmars.to/n/dev-blog/2012/06/rspecs-new-expectation-syntax
>>  [`allow` syntax]: https://github.com/rspec/rspec-mocks#method-stubs
>>  [one-liners with an implicit subject]: https://github.com/rspec/rspec-expectations/blob/master/Should.md#one-liners
>> +[predicate-example]: /style/samples/predicate_tests.rb
> should the file be nested under `samples`? seems like this link might be broken
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