Also add links for build plugins

Author: LucaScorpion

pom.xml

@@ -113,6 +113,7 @@
 
     <build>
         <plugins>
+            <!-- http://mvnrepository.com/artifact/org.apache.maven.plugins/maven-compiler-plugin -->
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
@@ -122,6 +123,7 @@
                     <target>${java.version}</target>
                 </configuration>
             </plugin>
+            <!-- http://mvnrepository.com/artifact/org.apache.maven.plugins/maven-failsafe-plugin -->
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-failsafe-plugin</artifactId>
@@ -151,6 +153,7 @@
             </activation>
             <build>
                 <plugins>
+                    <!-- http://mvnrepository.com/artifact/org.apache.maven.plugins/maven-source-plugin -->
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-source-plugin</artifactId>
@@ -164,6 +167,7 @@
                             </execution>
                         </executions>
                     </plugin>
+                    <!-- http://mvnrepository.com/artifact/org.apache.maven.plugins/maven-javadoc-plugin -->
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-javadoc-plugin</artifactId>
@@ -180,6 +184,7 @@
                             <quiet>true</quiet>
                         </configuration>
                     </plugin>
+                    <!-- http://mvnrepository.com/artifact/org.apache.maven.plugins/maven-gpg-plugin -->
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-gpg-plugin</artifactId>