B-38216 Improvements for http-logging-config.xsd

Updated XSD to better check logging configuration file.
Merge pull request #529 from usnavi/logging.xsd

B-38216 Improvements for http-logging-config.xsd
removed git annotations
Merge branch 'master' of https://github.com/rackerlabs/repose
updated http logging pom to get project version and not constant.