rounding out API coverage in 'Virtual Machine section

lib/fog/cloudstack/compute.rb

@@ -20,6 +20,7 @@ module Fog
       request :assign_to_load_balancer_rule
       request :attach_volume
       request :authorize_security_group_ingress
+      request :change_service_for_virtual_machine
       request :create_account
       request :create_domain
       request :create_port_forwarding_rule
@@ -82,8 +83,10 @@ module Fog
       request :list_virtual_machines
       request :list_volumes
       request :list_zones
+      request :migrate_virtual_machine
       request :query_async_job_result
       request :reboot_virtual_machine
+      request :recover_virtual_machine
       request :register_user_keys
       request :remove_from_load_balancer_rule
       request :reset_password_for_virtual_machine

lib/fog/cloudstack/requests/compute/change_service_for_virtual_machine.rb

@@ -0,0 +1,20 @@
+module Fog
+  module Compute
+    class Cloudstack
+      class Real
+
+        # Changes the service offering for a virtual machine. The virtual machine must be in a "Stopped" state for this command to take effect.
+        #
+        # {CloudStack API Reference}[http://download.cloud.com/releases/2.2.0/api_2.2.12/global_admin/changeServiceForVirtualMachine.html]
+        def change_service_for_virtual_machine(options={})
+          options.merge!(
+            'command' => 'changeServiceForVirtualMachine'
+          )
+
+          request(options)
+        end
+
+      end
+    end
+  end
+end

lib/fog/cloudstack/requests/compute/migrate_virtual_machine.rb

@@ -0,0 +1,20 @@
+module Fog
+  module Compute
+    class Cloudstack
+      class Real
+
+        # Attempts Migration of a virtual machine to the host specified
+        #
+        # {CloudStack API Reference}[http://download.cloud.com/releases/2.2.0/api_2.2.12/global_admin/migrateVirtualMachine.html]
+        def migrate_virtual_machine(options={})
+          options.merge!(
+            'command' => 'migrateVirtualMachine'
+          )
+
+          request(options)
+        end
+
+      end
+    end
+  end
+end

lib/fog/cloudstack/requests/compute/recover_virtual_machine.rb

@@ -0,0 +1,20 @@
+module Fog
+  module Compute
+    class Cloudstack
+      class Real
+
+        # Recovers a virtual machine.
+        #
+        # {CloudStack API Reference}[http://download.cloud.com/releases/2.2.0/api_2.2.4/global_admin/recoverVirtualMachine.html]
+        def recover_virtual_machine(options={})
+          options.merge!(
+            'command' => 'recoverVirtualMachine'
+          )
+
+          request(options)
+        end
+
+      end
+    end
+  end
+end