create extension directory

pom.xml

@@ -81,6 +81,7 @@
 		<packaging.fess.lib.dir>${packaging.fess.home.dir}/lib</packaging.fess.lib.dir>
 		<packaging.fess.log.dir>/var/log/fess</packaging.fess.log.dir>
 		<packaging.fess.temp.dir>/var/tmp/fess</packaging.fess.temp.dir>
+		<packaging.fess.extension.dir>${packaging.fess.home.dir}/extension</packaging.fess.extension.dir>
 		<packaging.fess.user>fess</packaging.fess.user>
 		<packaging.fess.group>fess</packaging.fess.group>
 		<packaging.fess.pid.dir>/var/run/fess</packaging.fess.pid.dir>
@@ -453,6 +454,14 @@
 								</source>
 							</sources>
 						</mapping>
+						<mapping>
+							<directory>${packaging.fess.extension.dir}</directory>
+							<sources>
+								<source>
+									<location>${project.basedir}/src/main/assemblies/extension</location>
+								</source>
+							</sources>
+						</mapping>
 						<mapping>
 							<directory>${packaging.fess.var.dir}</directory>
 							<filemode>755</filemode>

src/main/assemblies/common-bin.xml

@@ -21,6 +21,10 @@
 				<include>service.bat</include>
 			</includes>
 		</fileSet>
+		<fileSet>
+			<directory>src/main/assemblies/extension</directory>
+			<outputDirectory>fess-${project.version}/extension</outputDirectory>
+		</fileSet>
 		<fileSet>
 			<filtered>false</filtered>
 			<directory>src/main/assemblies/files</directory>