rails/rails — pull request #8532 by ptn (2012-12-17 01:31:17+00:00)
Title: Add missing requires to core_ext/integer/time

Fixes this:

```ruby
[1] pry(main)> require 'active_support/core_ext/integer/time'
=> true
[2] pry(main)> 3.months
NameError: uninitialized constant Integer::ActiveSupport
```

Reported in #8531