Update web.xml

Version 2.5 should be under javaee namespace.
Update README.md

Some notes to the CDX-Server Configuration
Merge pull request #1 from aponb/patch-2

Update web.xml
Merge pull request #2 from aponb/patch-3

Update README.md
New renderer to handle RSS.
Give access to default url regex pattern.
Merge branch 'ari-3858' into upstream-ait-qa