Library incorrectly removes the hostname and protocol from Web Proxy paths

[kellysutton]

Given an example Web Proxy source: my-web-proxy.imgix.net

This Ruby library incorrectly removes the protocol and hostname from full URL "paths" given to the library, e.g.

client = Imgix::Client.new(host: 'my-web-proxy.imgix.net', token: 'your-token', secure: true)
client.sign_path("https://some-other-image-site.com/cats.png")
 #=> "https://my-web-proxy.imgix.net/cats.png?&s=abc123"

Instead, the URL should maintain the full URL of the input image:

https://my-web-proxy.imgix.net/https://some-other-image-site.com/cats.png?&s=abc123

[kellysutton]

Note on this. This now works correctly with the Client#path style of generating URLs, e.g.

client.path("https://google.com/cats.gif").to_url

It does not yet work with Client#sign_path.