Upgrade to logback 1.1.3

Changelog:

http://logback.qos.ch/news.html

Author: gaul

pom.xml

@@ -242,7 +242,7 @@
     <dependency>
       <groupId>ch.qos.logback</groupId>
       <artifactId>logback-classic</artifactId>
-      <version>1.1.2</version>
+      <version>1.1.3</version>
     </dependency>
     <dependency>
       <groupId>com.google.guava</groupId>