Compatibility with Rails 4.1

[DarthSim]

This PR adds compatibility with Rails 4.1. Unfortunately it also breaks compatibility with older versions of Rails. Hope this is what you need to make Thinking Sphinx work with 4.1.
Note: Rails 4 doesn't support :condition option for associations so I had to remove this functionality from joiner.

[pat]

Thanks for this, it's greatly appreciated! I'll try to kick the tires and see how we go over the next few days.

When you have a spare moment, would you be able to remove Pry references (in the gemspec and the .pryrc file) and squash the commits?

[pat]

And yes: having it work with only Rails 4.1 is fine - my goal is to keep the interface static, so different joiner gem versions can support different Rails versions, and Thinking Sphinx doesn't need to care about which version of joiner is being used.

Hence, the existing release of joiner that supports Rails 4.0 and 3.2 covers those options.

[DarthSim]

When you have a spare moment, would you be able to remove Pry references (in the gemspec and the .pryrc file) and squash the commits?

Done

And yes: having it work with only Rails 4.1 is fine - my goal is to keep the interface static, so different joiner gem versions can support different Rails versions, and Thinking Sphinx doesn't need to care about which version of joiner is being used.

I thought so :)

[pat]

Appreciate the quick turnaround. I should have time this weekend to get this reviewed, merged, and a new version out! /cc @atipugin

[pat]

Just merged this into master and released 0.3.0 - many thanks for all of your hard work!