Use XZ compression instead of BZ2

Author: kayahr

src/main/assembly/tarball.xml

@@ -4,7 +4,7 @@
           xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
   <id>tarball</id>
   <formats>
-    <format>tar.bz2</format>
+    <format>tar.xz</format>
   </formats>
   <fileSets>
     <fileSet>
@@ -30,7 +30,7 @@
   </fileSets>
   <dependencySets>
     <dependencySet>
-      <outputDirectory>lib</outputDirectory> 
+      <outputDirectory>lib</outputDirectory>
       <unpack>false</unpack>
       <scope>runtime</scope>
       <excludes>
@@ -39,5 +39,5 @@
         <exclude>org.apache.commons:commons-lang3</exclude>
       </excludes>
     </dependencySet>
-  </dependencySets>  
+  </dependencySets>
 </assembly>