Exclude log4j from elk import, drop redundant logback.xml

Author: jamesaoverton

pom.xml

@@ -211,16 +211,8 @@
       <version>0.4.3</version>
       <exclusions>
         <exclusion>
-          <groupId>org.slf4j</groupId>
-          <artifactId>slf4j-log4j12</artifactId>
-        </exclusion>
-        <exclusion>
-          <groupId>org.slf4j</groupId>
-          <artifactId>slf4j-api</artifactId>
-        </exclusion>
-        <exclusion>
-          <groupId>org.slf4j</groupId>
-          <artifactId>slf4j-simple</artifactId>
+          <groupId>log4j</groupId>
+          <artifactId>log4j</artifactId>
         </exclusion>
         <exclusion>
           <groupId>net.sourceforge.owlapi</groupId>