INT-2981 - Add Rename (mv) to (S)FTP Gateway

* (S)FTP Change Commands, Options to Enums
* INT-2981 Add Support For 'mv' To File/Remote/GW
* INT-2981 (S)FTP Namespace Support and Docs
* INT-2981 Create Remote Dirs if Needed
* INT-2981 Add 'mv' Command to What's New
* INT-2981 Polishing - PR Comments
* Add javadocs to enums.
* Polish schemas to use an enumerated type for available gateway commands

spring-integration-ftp/src/main/resources/org/springframework/integration/ftp/config/spring-integration-ftp-3.0.xsd

@@ -3,6 +3,7 @@
 	xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:beans="http://www.springframework.org/schema/beans"
 	xmlns:tool="http://www.springframework.org/schema/tool"
 	xmlns:integration="http://www.springframework.org/schema/integration"
+	xmlns:int-file="http://www.springframework.org/schema/integration/file"
 	targetNamespace="http://www.springframework.org/schema/integration/ftp"
 	elementFormDefault="qualified" attributeFormDefault="unqualified">
 
@@ -10,6 +11,8 @@
 	<xsd:import namespace="http://www.springframework.org/schema/tool" />
 	<xsd:import namespace="http://www.springframework.org/schema/integration"
 		schemaLocation="http://www.springframework.org/schema/integration/spring-integration-3.0.xsd" />
+	<xsd:import namespace="http://www.springframework.org/schema/integration/file"
+		schemaLocation="http://www.springframework.org/schema/integration/file/spring-integration-file-3.0.xsd" />
 
 	<xsd:element name="outbound-channel-adapter">
 		<xsd:annotation>
@@ -238,12 +241,15 @@
 					<xsd:all>
 						<xsd:element name="request-handler-advice-chain" type="integration:adviceChainType" minOccurs="0" maxOccurs="1" />
 					</xsd:all>
-					<xsd:attribute name="command" use="required" type="xsd:string">
+					<xsd:attribute name="command" use="required">
 						<xsd:annotation>
 							<xsd:documentation>
-								FTP command - ls, get or rm
+								FTP command.
 							</xsd:documentation>
 						</xsd:annotation>
+						<xsd:simpleType>
+							<xsd:union memberTypes="int-file:remoteGatewayCommand xsd:string"/>
+						</xsd:simpleType>
 					</xsd:attribute>
 					<xsd:attribute name="command-options" type="xsd:string">
 						<xsd:annotation>
@@ -270,6 +276,15 @@
 							</xsd:documentation>
 						</xsd:annotation>
 					</xsd:attribute>
+					<xsd:attribute name="rename-expression" type="xsd:string">
+						<xsd:annotation>
+							<xsd:documentation>
+								SpEL expression representing the path for the
+								new filename when using the 'mv' command. Defaults
+								to "headers.['file_renameTo']".
+							</xsd:documentation>
+						</xsd:annotation>
+					</xsd:attribute>
 					<xsd:attribute name="request-channel" type="xsd:string">
 						<xsd:annotation>
 							<xsd:appinfo>
@@ -507,5 +522,4 @@
 		</xsd:attribute>
 	</xsd:complexType>
 
-
 </xsd:schema>