Restore changes of revision 155099: Remove Last-Modified header initialization: this is done in the environment by request from AbstractProcessingPipeline. (http://marc.info/?l=xml-cocoon-dev&m=120477652124530&w=4)

Files:
modified: /cocoon/trunk/core/cocoon-pipeline/cocoon-pipeline-components/src/main/java/org/apache/cocoon/reading/ResourceReader.java (try)