Change boot-test to only execute when Java 7 or higher is available

Since 1.4.0.RELEASE the spring-boot-gradle plugin requires at least
Java 7 so we decided to follow this version requirement for this
subproject.

settings.gradle

@@ -1,13 +1,16 @@
 include "spock-core"
 include "spock-specs"
 include "spock-spring"
-include "spock-spring:boot-test"
 include "spock-guice"
 include "spock-tapestry"
 include "spock-unitils"
 include "spock-report"
 include "spock-gradle"
 
+if (JavaVersion.current().java7Compatible) {
+  include "spock-spring:boot-test"
+}
+
 rootProject.name = "spock"
 nameBuildScriptsAfterProjectNames(rootProject.children)
 

spock-spring/boot-test/boot-test.gradle

@@ -17,18 +17,10 @@ apply plugin: 'spring-boot'
 
 
 
-ext['tomcat.version'] = '7.0.59' // use Tomcat 7 to ensure Java 6 compatibility
 dependencies {
-  compile("org.springframework.boot:spring-boot-starter-data-jpa") {
-    // for Java 6 compatibility, see http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#how-to-use-java-6-jta-api
-    exclude group: "javax.transaction", module: "javax.transaction-api"
-  }
-
-  compile "org.jboss.spec.javax.transaction:jboss-transaction-api_1.2_spec:1.0.0.Final"
-
+  compile "org.springframework.boot:spring-boot-starter-data-jpa"
   compile "org.springframework.boot:spring-boot-starter-web"
 
-
   testCompile "org.springframework.boot:spring-boot-starter-test"
   testCompile project(":spock-core")