Update to GWT 2.1.1

We need to use gwtjsonrpc 1.2.3 as it has support for the
newer GWT remote APIs.

Change-Id: I83bfe72d51611d4ee6f201f524c45d3ec2d020ed
Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/pom.xml b/pom.xml
index 12e065f..ef8e962 100644
--- a/pom.xml
+++ b/pom.xml
@@ -48,9 +48,9 @@
   <properties>
     <jgitVersion>0.9.3.298-g18abb81</jgitVersion>
     <gwtormVersion>1.1.4</gwtormVersion>
-    <gwtjsonrpcVersion>1.2.2</gwtjsonrpcVersion>
+    <gwtjsonrpcVersion>1.2.3</gwtjsonrpcVersion>
     <gwtexpuiVersion>1.2.2</gwtexpuiVersion>
-    <gwtVersion>2.0.4</gwtVersion>
+    <gwtVersion>2.1.1</gwtVersion>
     <slf4jVersion>1.6.1</slf4jVersion>
     <guiceVersion>2.0</guiceVersion>
     <jettyVersion>7.2.1.v20101111</jettyVersion>
@@ -355,7 +355,7 @@
         <plugin>
           <groupId>org.codehaus.mojo</groupId>
           <artifactId>gwt-maven-plugin</artifactId>
-          <version>1.2</version>
+          <version>2.1.0-1</version>
         </plugin>
 
         <plugin>