Cacheable's railtie references a middleware class from Shopify

[codyfauser]

https://github.com/Shopify/cacheable/blob/master/lib/cacheable/railtie.rb#L5

[cjoudrey]

@codyfauser @arthurnn would it make sense to remove the railtie.rb and add this to the README.md:

config.middleware.insert_before 'Rack::ETag', 'Cacheable::Middleware'

[arthurnn]

yep... I think we should remove that line from the reailtie, and add the instruction into the readme..

I can do that, if you didnt start it yet.

[cjoudrey]

@arthurnn I didn't start. I was asking because I was going to get a README up. :)

[arthurnn]

[cjoudrey]

Fixed by #22