add 'ant bundle' target which generates a git bundle target iff the working copy is a git repository. Does not work with mtn clones.

build.xml

@@ -27,6 +27,7 @@
         <echo message="  installer5, installer5-linux, installer5-nowindows, installer5-windows: use IzPack 5" />
         <echo message="  osxLauncher: build the Mac OS X router/GUI launcher (OSX only)" />
         <echo message="  bbLauncher: build the Browser Bundle router launcher" />
+        <echo message="  bundle:    (GIT ONLY!) generate a git bundle and a corresponding torrent." />
         <echo message="  tarball:   tar the full install into i2p.tar.bz2 (extracts to build a new clean install)" />
         <echo message="  updater:   Package the built files in i2pupdate.zip (extracts safely over existing installs)" />
         <echo message="  updater200: Updater compressed with pack200 (creates i2pupdate200.zip, 60% smaller)" />
@@ -2992,4 +2993,16 @@
 		<checksum file="portable-win32.zip" forceOverwrite="yes"/>
 		<move file="portable" tofile="pkg-temp"/>
 	</target>
+    <target name = "bundle" depends="pkg">
+        <exec executable="git" failonerror="true">
+            <arg value="bundle" />
+            <arg value="create" />
+            <arg value="i2p.i2p.bundle" />
+            <arg value="--all" />
+            <arg value="--branches" />
+            <arg value="--tags" />
+        </exec>
+        <mktorrent file="i2p.i2p.bundle" />
+    </target>
+
 </project>