Review by kkolinko
- disable use of gzip version for included resources
- don't change the content type of the gzip'd version of the resource
- use eTag and last modified date from original rather than gzip'd version
- don't fall back to write when using gzip'd version

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1531696 13f79535-47bb-0310-9956-ffa450edef68