Bump GWT version to 2.7.0

This is the same GWT version that is also used by Gerrit core.

Change-Id: Ib2438c524b81f07e433aa7242625015222399fac
Signed-off-by: Edwin Kempin <ekempin@google.com>

pom.xml

diff --git a/pom.xml b/pom.xml
index 3177bc0..b607858 100644
--- a/pom.xml
+++ b/pom.xml
@@ -71,7 +71,7 @@
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>gwt-maven-plugin</artifactId>
-        <version>2.6.1</version>
+        <version>2.7.0</version>
         <configuration>
           <module>com.googlesource.gerrit.plugins.imagare.Imagare</module>
           <disableClassMetadata>true</disableClassMetadata>
@@ -108,7 +108,7 @@
     <dependency>
       <groupId>com.google.gwt</groupId>
       <artifactId>gwt-user</artifactId>
-      <version>2.6.1</version>
+      <version>2.7.0</version>
       <scope>provided</scope>
     </dependency>
   </dependencies>