change apollo-core to 1.7

apollo-core/pom.xml

@@ -12,6 +12,7 @@
 	<name>Apollo Core</name>
 	<packaging>jar</packaging>
 	<properties>
+		<java.version>1.7</java.version>
 		<github.path>${project.artifactId}</github.path>
 	</properties>
 	<dependencies>