Revert to older version of logback that is compatible with Java 8

Author: thomaskrause

pepper-lib/pom.xml

@@ -32,12 +32,12 @@
 		<dependency>
 			<groupId>ch.qos.logback</groupId>
 			<artifactId>logback-classic</artifactId>
-			<version>1.5.12</version>
+			<version>1.3.14</version>
 		</dependency>
 		<dependency>
 			<groupId>ch.qos.logback</groupId>
 			<artifactId>logback-core</artifactId>
-			<version>1.5.12</version>
+			<version>1.3.14</version>
 		</dependency>
 		<dependency>
 			<groupId>commons-io</groupId>