Speed up builds by using an older version of maven-source-plugin (2.4) that doesn't have speed issues on ubuntu (as does 3.0.0)

Author: cgruber

pom.xml

@@ -237,7 +237,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-source-plugin</artifactId>
-        <version>3.0.0</version>
+        <version>2.4</version>
         <executions>
           <execution>
             <id>attach-sources</id>