First draft:

* twitter emoji files added (v2 only)
* Wrapper added
* basic usage added
* pom.xml is used to create the jar
* jar is usable in other gwt projects

.gitignore

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+target/
+*.iml
+.idea/

README.md

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+gwt-twemoji
+===========
+
+This project aims to wrap the Twitter Emoji (https://github.com/twitter/twemoji) with GWT.
+
+Basic Usage
+-----------
+Twemoji twemoji = new Twemoji();
+twemoji.init(); // init the wrapper
+String stringWithReplacedEmojis = twemoji.parse(strinWithUnicodes);

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>de.phpmonkeys</groupId>
+	<artifactId>gwt-twemoji</artifactId>
+	<packaging>jar</packaging>
+	<version>1.0-SNAPSHOT</version>
+
+	<properties>
+		<gwt.version>2.7.0</gwt.version>
+		<maven.compiler.source>1.7</maven.compiler.source>
+		<maven.compiler.target>1.7</maven.compiler.target>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>com.google.gwt</groupId>
+			<artifactId>gwt-user</artifactId>
+			<version>${gwt.version}</version>
+			<scope>provided</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<resources>
+			<!-- bundle sources with the jar, so they are visible to GWT's compiler -->
+			<!-- bundle the module descriptor with the jar, so it is visible to GWT's 
+				compiler -->
+			<resource>
+				<directory>src/main/java</directory>
+				<includes>
+					<include>**/*.java</include>
+					<include>**/*.gwt.xml</include>
+				</includes>
+			</resource>
+			<resource>
+				<directory>src/main/resources</directory>
+				<includes>
+					<include>**/72x72/*</include>
+					<include>**/*.js</include>
+				</includes>
+			</resource>
+		</resources>
+	</build>
+</project>

src/main/java/de/phpmonkeys/gwt/twemoji/Gwttwemoji.gwt.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 1.7.1//EN" "http://google-web-toolkit.googlecode.com/svn/tags/1.7.1/distro-source/core/src/gwt-module.dtd">
+<module>
+  <!-- Inherit the core Web Toolkit stuff.                        -->
+  <inherits name='com.google.gwt.user.User'/>
+
+  <public path="public"/>
+</module>

src/main/java/de/phpmonkeys/gwt/twemoji/client/Twemoji.java

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+package de.phpmonkeys.gwt.twemoji.client;
+
+import com.google.gwt.core.client.GWT;
+import com.google.gwt.core.client.ScriptInjector;
+
+public class Twemoji {
+
+    private String baseUrl;
+
+    public Twemoji() {
+        baseUrl = GWT.getModuleBaseURL() + "twemoji/";
+    }
+
+    public void init() {
+        injectScript();
+        initNative(baseUrl);
+    }
+
+    private final native void initNative(String baseUrl)/*-{
+        $wnd.twemoji.base = baseUrl;
+    }-*/;
+
+    public String parse(String htmlString) {
+        return parseNative(htmlString);
+    }
+
+    private final native String parseNative(String htmlString)/*-{
+        return $wnd.twemoji.parse(htmlString);
+    }-*/;
+
+    private void injectScript() {
+        if (!isInjected()) {
+            ScriptInjector.fromString(TwemojiClientBundle.INSTANCE.twemojiJs().getText()).setWindow(ScriptInjector.TOP_WINDOW).inject();
+        }
+    }
+
+    private native final boolean isInjected() /*-{
+      if (!(typeof $wnd.twemoji === "undefined") && !(null===$wnd.twemoji)) {
+        return true;
+      }
+      return false;
+    }-*/;
+}

src/main/java/de/phpmonkeys/gwt/twemoji/client/TwemojiClientBundle.java

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+package de.phpmonkeys.gwt.twemoji.client;
+
+import com.google.gwt.core.client.GWT;
+import com.google.gwt.resources.client.ClientBundle;
+import com.google.gwt.resources.client.TextResource;
+
+public interface TwemojiClientBundle extends ClientBundle {
+
+    TwemojiClientBundle INSTANCE = GWT.create(TwemojiClientBundle.class);
+
+    @Source("resources/twemoji.min.js")
+    TextResource twemojiJs();
+}