POM files: download javadoc and sources

[alphaville]

Example:

<dependency>
            <groupId>com.hp.hpl.jena</groupId>
            <artifactId>jena</artifactId>
            <version>2.6.4</version>
            <classifier>javadoc</classifier>
</dependency>

But, can be also done for all dependencies by adding this profile into settings.xml:

<profile>
            <id>downloadSources</id>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
            <properties>
                <downloadSources>true</downloadSources>
                <downloadJavadocs>true</downloadJavadocs>           
            </properties>
        </profile>