Add interfaces, cleanup code, remove log4j

pom.xml

@@ -1,15 +1,16 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 
 	<groupId>at.jotschi</groupId>
 	<artifactId>QuadTree</artifactId>
-	<version>0.5.0-SNAPSHOT</version>
+	<version>1.0.0-SNAPSHOT</version>
 	<packaging>jar</packaging>
 
 	<parent>
-		<groupId>de.jotschi</groupId>
-		<artifactId>oss-parent</artifactId>
+		<groupId>io.metaloom</groupId>
+		<artifactId>maven-parent</artifactId>
 		<version>1.0.0</version>
 	</parent>
 
@@ -21,27 +22,33 @@
 	</properties>
 
 	<dependencies>
+		<!-- Logging -->
+		<dependency>
+			<groupId>org.slf4j</groupId>
+			<artifactId>slf4j-api</artifactId>
+		</dependency>
+
 		<dependency>
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
 			<scope>test</scope>
 		</dependency>
 		<dependency>
-			<groupId>log4j</groupId>
-			<artifactId>log4j</artifactId>
-			<version>1.2.16</version>
+			<groupId>ch.qos.logback</groupId>
+			<artifactId>logback-classic</artifactId>
+			<scope>test</scope>
 		</dependency>
 	</dependencies>
-	<repositories>
-		<repository>
-			<id>maven.jotschi.de</id>
-			<url>http://maven.jotschi.de/maven2</url>
-			<releases>
-				<enabled>true</enabled>
-			</releases>
-			<snapshots>
-				<enabled>false</enabled>
-			</snapshots>
-		</repository>
-	</repositories>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<configuration>
+					<release>11</release>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
 </project>