INT-3418: Prepare 4.1 VERSION

JIRA: https://jira.spring.io/browse/INT-3418

* Create 4.1 XSD
* Clean up Docs for 4.1
* Prepare WebSocket module
* Add Reactor dependency
* Remove Eclipse and SNV artifacts

Phase #1: prepare

Conflicts:
	gradle.properties

spring-integration-websocket/src/main/resources/META-INF/spring.handlers

@@ -0,0 +1 @@
+http\://www.springframework.org/schema/integration/websocket=org.springframework.integration.websocket.config.WebSocketNamespaceHandler

spring-integration-websocket/src/main/resources/META-INF/spring.schemas

@@ -0,0 +1,2 @@
+http\://www.springframework.org/schema/integration/websocket/spring-integration-websocket-4.1.xsd=org/springframework/integration/websocket/config/spring-integration-websocket-4.1.xsd
+http\://www.springframework.org/schema/integration/websocket/spring-integration-websocket.xsd=org/springframework/integration/websocket/config/spring-integration-websocket-4.1.xsd

spring-integration-websocket/src/main/resources/META-INF/spring.tooling

@@ -0,0 +1,4 @@
+# Tooling related information for the integration websocket namespace
+http\://www.springframework.org/schema/integration/websocket@name=integration websocket Namespace
+http\://www.springframework.org/schema/integration/websocket@prefix=int-websocket
+http\://www.springframework.org/schema/integration/websocket@icon=org/springframework/integration/websocket/config/spring-integration-websocket.gif

spring-integration-websocket/src/main/resources/org/springframework/integration/websocket/config/spring-integration-websocket-4.1.xsd

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xsd:schema xmlns="http://www.springframework.org/schema/integration/websocket"
+		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"
+		targetNamespace="http://www.springframework.org/schema/integration/websocket"
+		elementFormDefault="qualified"
+		attributeFormDefault="unqualified">
+
+	<xsd:import namespace="http://www.springframework.org/schema/beans"/>
+	<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.xsd"/>
+
+	<xsd:annotation>
+		<xsd:documentation><![CDATA[
+	Defines the configuration elements for Spring Integration's WebSocket adapters.
+		]]></xsd:documentation>
+	</xsd:annotation>
+
+</xsd:schema>