Fixed poliqarp layer bug (#52) & replaced log4j with log4j2.

Change-Id: I29e34b51ae71aaf98e59d206d54f8c640824ef2e
diff --git a/pom.xml b/pom.xml
index 7d5a151..5129347 100644
--- a/pom.xml
+++ b/pom.xml
@@ -108,24 +108,35 @@
 			<version>1.12</version>
 		</dependency>
 		<dependency>
-			<groupId>log4j</groupId>
-			<artifactId>log4j</artifactId>
-			<version>1.2.17</version>
+			<groupId>org.apache.logging.log4j</groupId>
+			<artifactId>log4j-api</artifactId>
+			<version>2.11.0</version>
 		</dependency>
 		<dependency>
-			<groupId>log4j</groupId>
-			<artifactId>apache-log4j-extras</artifactId>
-			<version>1.2.17</version>
+			<groupId>org.apache.logging.log4j</groupId>
+			<artifactId>log4j-core</artifactId>
+			<version>2.11.0</version>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.logging.log4j</groupId>
+			<artifactId>log4j-slf4j-impl</artifactId>
+			<version>2.11.0</version>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.logging.log4j</groupId>
+			<artifactId>log4j-jul</artifactId>
+			<version>2.11.0</version>
+			<exclusions>
+				<exclusion>
+					<groupId>org.slf4j</groupId>
+					<artifactId>slf4j-api</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>org.slf4j</groupId>
 			<artifactId>slf4j-api</artifactId>
-			<version>1.7.5</version>
-		</dependency>
-		<dependency>
-			<groupId>org.slf4j</groupId>
-			<artifactId>slf4j-log4j12</artifactId>
-			<version>1.7.5</version>
+			<version>1.7.25</version>
 		</dependency>
 		<dependency>
 			<groupId>eu.clarin.sru.fcs</groupId>