[2.3.x] Fix new findbugs warnings.
[2.3.x] Slight tweak to the bundle source/javadoc changes.  Use antrun plugin to delete 'src' directory in the install phase.  Keeping the delete reference in the clean plugin configuration just in case.
[2.3.x] + rename Compression -> CompressionConfig
[2.3.x] Remove documentation from BOM.
[2.3.x] Changes for https://java.net/jira/browse/GRIZZLY-1567 (Remove obsolete draft implementations from websockets.)
[2.3.x] Fix copyrights.
[2.3.x] + cleanup isSendFileEnabled artifacts in the Request object
[2.3.x] + implement feature #1565
https://java.net/jira/browse/GRIZZLY-1565

"Implement sendfile support for FileCache"
[2.3.x] Minor code cleanup.