Add pluginDescription for Surefire, Core, Design

plugins/sonar-core-plugin/pom.xml

           <pluginKey>core</pluginKey>
           <pluginName>Core</pluginName>
           <pluginClass>org.sonar.plugins.core.CorePlugin</pluginClass>
+          <pluginDescription><![CDATA[Provides all common components required to cover all languages.]]></pluginDescription>
         </configuration>
       </plugin>
       <plugin>

plugins/sonar-design-plugin/pom.xml

           <pluginKey>design</pluginKey>
           <pluginName>Design</pluginName>
           <pluginClass>org.sonar.plugins.design.DesignPlugin</pluginClass>
+          <pluginDescription><![CDATA[Analyze Java bytecode to compute O.O. metrics and extract dependencies between resources.]]></pluginDescription>
         </configuration>
       </plugin>
 

plugins/sonar-squid-java-plugin/pom.xml

   <artifactId>sonar-squid-java-plugin</artifactId>
   <packaging>sonar-plugin</packaging>
   <name>Sonar :: Plugins :: Squid Java</name>
-  <description>Squid analyzer for Java</description>
+  <description>Squid analyzer for Java.</description>
 
   <dependencies>
     <dependency>
       <groupId>org.codehaus.sonar</groupId>
       <artifactId>sonar-testing-harness</artifactId>
       <scope>test</scope>
-    </dependency>    
+    </dependency>
   </dependencies>
 
   <build>
       </plugin>
     </plugins>
   </build>
-</project>
+</project>

plugins/sonar-surefire-plugin/pom.xml

           <pluginKey>surefire</pluginKey>
           <pluginName>Surefire</pluginName>
           <pluginClass>org.sonar.plugins.surefire.SurefirePlugin</pluginClass>
+          <pluginDescription><![CDATA[Get results of unit tests with <a href='http://maven.apache.org/plugins/maven-surefire-plugin/'>Surefire</a>.]]></pluginDescription>
         </configuration>
       </plugin>
-      
+
       <plugin>
         <artifactId>maven-deploy-plugin</artifactId>
         <configuration>
 
     </plugins>
   </build>
-</project>
+</project>