Added Update User command to IAM

Gemfile.lock

@@ -15,7 +15,7 @@ GEM
   remote: http://rubygems.org/
   specs:
     builder (3.0.0)
-    excon (0.5.5)
+    excon (0.5.6)
     formatador (0.0.16)
     json (1.5.1)
     mime-types (1.16)

lib/fog/aws/iam.rb

@@ -28,6 +28,7 @@ module Fog
       request :put_user_policy
       request :remove_user_from_group
       request :update_access_key
+      request :update_user
       request :upload_signing_certificate
 
       class Mock

lib/fog/aws/parsers/iam/update_user.rb

@@ -0,0 +1,26 @@
+module Fog
+  module Parsers
+    module AWS
+      module IAM
+
+        class UpdateUser < Fog::Parsers::Base
+
+          def reset
+            @response = { 'User' => {} }
+          end
+
+          def end_element(name)
+            case name
+            when 'Arn', 'UserId', 'UserName', 'Path'
+              @response['User'][name] = @value
+            when 'RequestId'
+              @response[name] = @value
+            end
+          end
+
+        end
+
+      end
+    end
+  end
+end

lib/fog/aws/requests/iam/update_user.rb

@@ -0,0 +1,39 @@
+module Fog
+  module AWS
+    class IAM
+      class Real
+
+        require 'fog/aws/parsers/iam/update_user'
+
+        # Update a user
+        # 
+        # ==== Parameters
+        # * user_name<~String> - Required. Name of the User to update. If you're changing the name of the User, this is the original User name.
+        # * options<~Hash>:
+        #   * new_path<~String> - New path for the User. Include this parameter only if you're changing the User's path.
+        #   * new_user_name<~String> - New name for the User. Include this parameter only if you're changing the User's name.
+        # ==== Returns
+        # * response<~Excon::Response>:
+        #   * body<~Hash>:
+        #     * 'RequestId'<~String> - Id of the request
+        #     * 'User'<~Hash> - Changed user info
+        #       * 'Arn'<~String> -
+        #       * 'Path'<~String> -
+        #       * 'UserId'<~String> -
+        #       * 'UserName'<~String> -
+        #
+        # ==== See Also
+        # http://docs.amazonwebservices.com/IAM/latest/APIReference/index.html?API_UpdateUser.html
+        #
+        def update_user(user_name, options = {})
+          request({
+            'Action'      => 'UpdateUser',
+            'UserName'    => user_name,
+            :parser       => Fog::Parsers::AWS::IAM::UpdateUser.new
+          }.merge!(options))
+        end
+
+      end
+    end
+  end
+end