Changed source and target java version to 1.6 and set the WE dependency to 5.3-SNAPSHOT.

pom.xml

@@ -40,7 +40,7 @@
     <dependency>
       <groupId>com.sk89q</groupId>
       <artifactId>worldedit</artifactId>
-      <version>5.2</version>
+      <version>5.3-SNAPSHOT</version>
     </dependency>
     
     <!-- Bukkit -->
@@ -112,6 +112,10 @@
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
         <version>2.3.2</version>
+        <configuration>
+          <source>1.6</source>
+          <target>1.6</target>
+        </configuration>
       </plugin>
 
       <!-- JAR creation plugin -->