Removed dependencies on Spring Boot starters

This commit removes the dependency on any Spring Boot starters.
Starters are still used in the test scope, but should not impact the
library's dependencies.

Resolves #294

spring-cloud-task-batch/pom.xml

@@ -45,6 +45,10 @@
 			<artifactId>spring-batch-integration</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>commons-logging</groupId>
+			<artifactId>commons-logging-api</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-test</artifactId>