added comment that explaines that mvn resources:testResources has to be executed after each clean in Eclipse

[mvonrenteln]

Added comment:

/**
 * NOTE: The source files in src/test/resources/source have to be
 * copied to the output directory as .java-Files for this test to be 
 * sucessfull.
 * The Eclipse project configuration created with "mvn eclipse:eclipse"
 * excludes .java files in the resources dir by default. If this filter 
 * is removed the .java-Files are still comiled by eclipse before copying
 * it to the target directory.
 * 
 * So to launch this test in eclipse the following Maven command has to be 
 * executed after each "Project - clean" in Eclipse:
 * "mvn resources:testResources" 
 */