Simple ImpactJS Ant Build - Use this to bake and copy your game over to a deploy folder so you can easily publish it.

build.xml

<?xml version="1.0"?>
<project name="Impact Ant Build" basedir="." default="full-build">

    <!-- Change these properties based on your project -->

    <!-- Project meta data -->
    <property name="project.name" value="Resident Raver"/>
    <property name="company.name" value="GameCook"/>
    <property name="company.site" value="http://gamecook.com"/>
    <property name="project.version" value="0.8.1"/>
    <property name="project.description" value="This is Resident Raver the Game!"/>
    <property name="project.url" value="http://gamecook.com/games/resident-raver/"/>


    <!-- Deployment directories -->
    <property name="deploy.dir" value="deploy"/>
    <property name="web.dir" value="${deploy.dir}/web"/>
    <property name="chrome.dir" value="${deploy.dir}/chrome"/>
    <property name="mozilla.dir" value="${deploy.dir}/mozilla"/>
    <property name="ios.dir" value="${deploy.dir}/ios"/>
    <property name="win8.dir" value="${deploy.dir}/win8"/>

    <!-- Path to Impact directory -->
    <property name="impact.dir" value="${basedir}/impact"/>

    <target name="full-build">
        <!-- Clean -->
        <antcall target="pre-build-cleanup"/>
        <antcall target="bake"/>
        <antcall target="web-build"/>
        <antcall target="ios-build"/>
        <antcall target="win8-build"/>
        <antcall target="chrome-build"/>
        <antcall target="mozilla-build"/>
        <antcall target="post-build-cleanup"/>
        <!-- Bake -->
    </target>

    <!-- Delete deploy directory and create a new one -->
    <target name="pre-build-cleanup">
        <delete dir="${deploy.dir}"/>
        <mkdir dir="${deploy.dir}"/>
    </target>

    <!-- Removes the minified game from the impact directory-->
    <target name="post-build-cleanup">
        <delete file="${impact.dir}/game.min.js"/>
    </target>

    <!-- Run the bake script - you need PHP to be runnable from the command line. -->
    <target name="bake">

        <exec dir="${impact.dir}" executable="php">
            <arg value="${impact.dir}/tools/bake.php"/>
            <arg value="lib/impact/impact.js"/>
            <arg value="lib/game/main.js"/>
            <arg value="game.min.js"/>
        </exec>

    </target>

    <target name="web-build">
        <!-- Copy over the impact directory to the deploy folder and ignore what is not needed. -->
        <sync todir="${web.dir}">
            <fileset dir="${impact.dir}">
                <exclude name="weltmeister.html"/>
                <exclude name="**/tools/*"/>
                <exclude name="**/lib/**"/>
            </fileset>
        </sync>

        <!-- replace js source paths in HTML with minified game js. Make sure code is surrounded by "source script" comments so the regex can find it. -->
        <replaceregexp file="${web.dir}/index.html"
                       match="\&lt;!--source scripts--\&gt;(.*?)\&lt;!--end source scripts--\&gt;"
                       replace="\&lt;script src='game.min.js'\&gt;\&lt;/script\&gt;" flags="gs">
        </replaceregexp>
        <!-- This will copy over debug CSS if game is running in debug mode. -->

        <copy file="${impact.dir}/lib/impact/debug/debug.css"
              tofile="${web.dir}/lib/impact/debug/debug.css"/>
    </target>

    <target name="ios-build">
        <!-- copy over files for iOS -->
        <sync todir="${ios.dir}">
            <fileset dir="${web.dir}">

            </fileset>
        </sync>
    </target>

    <target name="win8-build">
        <!-- copy over files for Win8 -->
        <sync todir="${win8.dir}">
            <fileset dir="${web.dir}">

            </fileset>
        </sync>
    </target>

    <target name="chrome-build">

        <!-- Create chrome market app -->
        <sync todir="${chrome.dir}/tmp">
            <fileset dir="${web.dir}">

            </fileset>
        </sync>

        <echo file="${chrome.dir}/tmp/manifest.json" append="false">
            {
            "name": "${project.name}",
            "description": "${project.description}",
            "version": "${project.version}",
            "icons": {
            "16": "images/icons/icon-16x16.png",
            "48": "images/icons/icon-48x48.png",
            "128": "images/icons/icon-128x128.png"
            },
            "app": {"launch": {
            "local_path": "index.html"
            }},
            "homepage_url": "${project.url}"
            }
        </echo>

        <zip destfile="${chrome.dir}/${project.name}-${project.version}.zip" basedir="${chrome.dir}"/>
        <delete dir="${chrome.dir}/tmp/"/>
    </target>

    <target name="mozilla-build">
        <!-- Create Mozilla App -->
        <sync todir="${mozilla.dir}">
            <fileset dir="${web.dir}">

            </fileset>
        </sync>

        <echo file="${mozilla.dir}/manifest.json" append="false">
            {
            "name":"${project.name}",
            "developer": {
            "name":"${company.name}",
            "url":"${company.site}"
            },
            "description":"${project.description}",
            "icons":{
            "16": "/images/icons/icon-16x16.png",
            "48": "/images/icons/icon-48x48.png",
            "128": "/images/icons/icon-128x128.png"
            }
            }
        </echo>
    </target>

</project>

I've updated this to now create a Chrome Market zip of the app as well as a web deployable build.