Clarify that the Maven build requires Maven3 and cleanup temporary CGLIB dependency

git-svn-id: https://google-guice.googlecode.com/svn/trunk@1425 d779f126-a31b-0410-b53b-1d3aecad763e
diff --git a/pom.xml b/pom.xml
index ad61fca..0744078 100644
--- a/pom.xml
+++ b/pom.xml
@@ -89,6 +89,10 @@
     <module>extensions</module>
   </modules>
 
+  <prerequisites>
+    <maven>3.0</maven>
+  </prerequisites>
+
   <properties>
     <!--
      | The spec version of the public Guice API
@@ -107,15 +111,6 @@
 
   <dependencies>
     <!--
-     | Replace with official CGLIB artifact when it's released
-    -->
-    <dependency>
-      <groupId>org.sonatype.sisu.inject</groupId>
-      <artifactId>cglib</artifactId>
-      <version>2.2.1</version>
-      <optional>${guice.with.jarjar}</optional>
-    </dependency>
-    <!--
      | Run tests with TestNG
     -->
     <dependency>