ZOOKEEPER-2646: Java target in branch 3.4 doesn't match documentation

Author: fpj <fpj@apache.org>

Reviewers: Michael Han <hanm@apache.org>

Closes #127 from fpj/ZK-2646

build.xml

@@ -36,8 +36,8 @@ xmlns:maven="antlib:org.apache.maven.artifact.ant">
     <property name="revision.properties" value="revision.properties" />
     <property file="${basedir}/src/java/${revision.properties}" />
 
-    <property name="javac.target" value="1.5" />
-    <property name="javac.source" value="1.5" />
+    <property name="javac.target" value="1.6" />
+    <property name="javac.source" value="1.6" />
 
     <property name="src.dir" value="${basedir}/src" />
     <property name="java.src.dir" value="${src.dir}/java/main" />
@@ -611,7 +611,7 @@ xmlns:maven="antlib:org.apache.maven.artifact.ant">
         </jar>
     </target>
 
-	<!-- ====================================================== -->
+    <!-- ====================================================== -->
     <!-- Make zookeeper-sources.jar                                 -->
     <!-- ====================================================== -->
     <target name="src-jar" depends="build-generated">