Added custom logging.xml file for idp

Custom logging.xml file now compresses the files to keep the size of the
logs low.
Added task to write logging.xml file to directory

New task added to copy over logging.xml file to shibboleth-idp conf
directory in order to allow compression of logs.
Merge pull request #140 from ausaccessfed/feature/logrotate-shibboleth-idp

Compress shibboleth idp logs
Resolves #139