remove spring-boot-starter-validation

fixes gh-7

turbine-amqp/pom.xml

@@ -42,11 +42,6 @@
 			<groupId>org.springframework.cloud</groupId>
 			<artifactId>spring-cloud-starter-turbine-amqp</artifactId>
 		</dependency>
-		<dependency>
-			<!-- Shouldn't be necessary -->
-			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-validation</artifactId>
-		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-test</artifactId>