Merge pull request #129 from sswguo/jdk8

Update maven-javadoc-plugin for compatibility with JDK 8

Author: sswguo

pom.xml

@@ -165,6 +165,8 @@
           <configuration>
             <detectOfflineLinks>false</detectOfflineLinks>
             <additionalparam>-Xdoclint:none</additionalparam>
+            <doclint>none</doclint>
+            <source>8</source>
           </configuration>
         </plugin>
         <plugin>