Update to GWT 2.8.0-SNAPSHOT

pom.xml

@@ -43,7 +43,7 @@
     <weld.se.version>${weld.version}</weld.se.version>
     <groovy.version>2.4.5</groovy.version>
     <guava.version>18.0</guava.version>
-    <gwt.version>2.7.0</gwt.version>
+    <gwt.version>2.8.0-SNAPSHOT</gwt.version>
     <icu4j.version>50.1.1</icu4j.version>
     <lombok.source.dir>${project.build.sourceDirectory}/org/zanata</lombok.source.dir>
     <lucene.version>3.6.2</lucene.version>
@@ -1432,6 +1432,18 @@
         <enabled>false</enabled>
       </snapshots>
     </repository>
+    <!-- Needed for GWT snapshots -->
+    <repository>
+      <id>google-maven-snapshot-repository</id>
+      <name>Google Maven Snapshot Repository</name>
+      <url>https://oss.sonatype.org/content/repositories/google-snapshots/</url>
+      <releases>
+        <enabled>false</enabled>
+      </releases>
+      <snapshots>
+        <enabled>true</enabled>
+      </snapshots>
+    </repository>
   </repositories>
 
   <pluginRepositories>
@@ -1552,6 +1564,7 @@
                 <allowedRepository>jboss-public-repository-group</allowedRepository>
                 <allowedRepository>okapi-cloudbees-release</allowedRepository>
                 <allowedRepository>repo.bodar.com</allowedRepository>
+                <allowedRepository>google-maven-snapshot-repository</allowedRepository>
               </allowedRepositories>
               <allowedPluginRepositories combine.children="append">
                 <allowedPluginRepository>apache.snapshots.https</allowedPluginRepository>