ARel 2.0.7 beta

Hi everyone!

I've released a beta version of ARel 2.0.7. I've tested it with our applications at work, and the Rails tests are green, but I'd like your feedback.

To try out the beta gem either do:

  $ gem install arel --pre

Or update your Gemfile with:

  gem 'arel', '~> 2.0.7.beta'

If everything seems good, I'll do an official release tomorrow. Thanks!

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