Add animal sniffer for Java 6 and jdk1.8 to actuator

The build now requires java 8 (although no language features are yet
in use). Bamboo has been updated.

Fixes gh-716

spring-boot-cli/src/it/java/org/springframework/boot/cli/CommandLineIT.java

@@ -42,7 +42,7 @@ public class CommandLineIT {
 			InterruptedException {
 		Invocation cli = this.cli.invoke("hint");
 		assertThat(cli.await(), equalTo(0));
-		assertThat(cli.getErrorOutput().length(), equalTo(0));
+		assertThat("Unexpected error: \n" + cli.getErrorOutput(), cli.getErrorOutput().length(), equalTo(0));
 		assertThat(cli.getStandardOutputLines().size(), equalTo(10));
 	}