Attempting to follow http://blog.zerosum.org/2011/03/02/better-aws-access-control-with-iam-and-fog.html fails when trying to run iam.create_access_key

fog create_access_key fails

% rvm use 1.9.2@fog --create
Using /Users/codecafe/.rvm/gems/ruby-1.9.2-p180 with gemset fog
% gem install fog
% gem list

*** LOCAL GEMS ***

builder (3.0.0)
excon (0.6.0)
fog (0.7.1)
formatador (0.1.2)
json (1.5.1)
mime-types (1.16)
net-ssh (2.1.3)
nokogiri (1.4.4)
rake (0.8.7)
ruby-hmac (0.4.0)

% irb
require 'fog'
new_username = 'myusername'
bucket_name = 'mybucket'
aws_credentials = { 
       :aws_access_key_id => 'XXXCXCATATTETT',
       :aws_secret_access_key => 'loremipsumgratisforumquorum',
     }
iam = Fog::AWS::IAM.new(aws_credentials)
user_response = iam.create_user(new_username)
key_response  = iam.create_access_key('UserName' => new_username)

Excon::Errors::SocketError: wrong number of arguments (3 for 1)
        from /Users/codecafe/.rvm/gems/ruby-1.9.2-p180@fog/gems/fog-0.7.1/lib/fog/core/connection.rb:16:in `block in request'
        from /Users/codecafe/.rvm/gems/ruby-1.9.2-p180@fog/gems/excon-0.6.0/lib/excon/response.rb:47:in `parse'
        from /Users/codecafe/.rvm/gems/ruby-1.9.2-p180@fog/gems/excon-0.6.0/lib/excon/connection.rb:140:in `request'
        from /Users/codecafe/.rvm/gems/ruby-1.9.2-p180@fog/gems/fog-0.7.1/lib/fog/core/connection.rb:20:in `request'
        from /Users/codecafe/.rvm/gems/ruby-1.9.2-p180@fog/gems/fog-0.7.1/lib/fog/aws/iam.rb:106:in `request'
        from /Users/codecafe/.rvm/gems/ruby-1.9.2-p180@fog/gems/fog-0.7.1/lib/fog/aws/requests/iam/create_access_key.rb:31:in `create_access_key'
        from (irb):12
        from /Users/codecafe/.rvm/rubies/ruby-1.9.2-p180/bin/irb:16:in `<main>'

fixed:
https://github.com/geemus/fog/issues/245#comment_960157