Use the latest version of the Spring IO Plugin

Spring IO Platform 2.0 will remove the managed versions .properties
file as support for it has been removed in Spring Boot 1.3.

This commit moves the build onto a new version of the Spring IO Plugin
that uses the Maven bom rather than the properties file.

build.gradle

@@ -10,7 +10,7 @@ buildscript {
 	dependencies {
 		classpath 'org.springframework.build.gradle:docbook-reference-plugin:0.2.8'
 		classpath 'org.springframework.build.gradle:propdeps-plugin:0.0.5'
-		classpath 'org.springframework.build.gradle:spring-io-plugin:0.0.3.RELEASE'
+		classpath 'io.spring.gradle:spring-io-plugin:0.0.4.RELEASE'
 	}
 }
 
@@ -219,8 +219,12 @@ configure(mainProjects) {
 			maven { url "https://repo.spring.io/libs-snapshot" }
 		}
 
-		dependencies {
-			springIoVersions "io.spring.platform:platform-versions:${platformVersion}@properties"
+		dependencyManagement {
+			springIoTestRuntime {
+				imports {
+					mavenBom "io.spring.platform:platform-bom:${platformVersion}"
+				}
+			}
 		}
 	}
 }
@@ -271,7 +275,7 @@ project('spring-batch-infrastructure') {
 		// permsize settings not passed down from GRADLE_OPTS nor JAVA_OPTS
 		// when running certain tests causing permgen OOM when using JDK7
 		// compilation is not performed with JDK6 and permgen is removed
-		// starting with JDK8.. 
+		// starting with JDK8..
 		if (JavaVersion.current().isJava7Compatible()) {
 			jvmArgs '-XX:MaxPermSize=256m'
 		}