Bring AWS CloudFront API Models/Requests up to date

[CpuID]

Heaps of missing functionality, specifically around the use of Price Classes, Custom/Dedicated SSL certificates, etc.

Current API version is 3~ years behind, has some authentication breakage when you try and just change the version to 2014-05-31:

 response => #<Excon::Response:0x007f991daab9b0 @data={:body=>"<?xml version=\"1.0\"?>\n<ErrorResponse xmlns=\"http://cloudfront.amazonaws.com/doc/2014-01-31/\"><Error><Type>Sender</Type><Code>IncompleteSignature</Code><Message>Authorization header requires 'Credential' parameter. Authorization header requires 'Signature' parameter. Authorization header requires 'SignedHeaders' parameter.

[CpuID]

I am will to go through and try make the require changes, but I will need some coaching on some of the Fog internals to do so...

[geemus]

@CpuID happy to help as you need it. Probably just need to switch from v3 signatures to v4 (at a guess). I think maybe EC2 (aws compute) already uses v4 if you need a point of reference.

[fcheung]

I had a quick look this afternoon - switching signature versions is easy enough but the change of api version changes the xml returned by some of the existing requests (eg get_distribution_list) in a way that stops the existing parser from processing it). There are what seem to be some quite substantial changes to the data returned, so this could in turn break users of the existing models/code. Definitely more work than just upgrading signatures and bumping api versions

[geemus]

@fcheung thanks for the update. Hopefully somebody with the interest/time can dig deeper on this one.

[plribeiro3000]

Closed in favor of fog/fog-aws#17