version update to latest geoserver binary

CHANGELOG.md

 Upcoming version:
 -----------------
+  - version update to latest geoserver binary (Nikolaus Krismer)
   - got rid of repoforge/rpmforge. cmake is not needed anymore (no pgrouting is used anymore). version udpates (Nikolaus Krismer)
   - disabling advanced projection handling in Geoserver's WMS, to prevent problems with useCoverageMask in isochrone-web (Nikolaus Krismer)
   - minor coverage style improvements (Nikolaus Krismer)

bootstrap/prepareEnvironment.sh

@@ -79,7 +79,7 @@ fn_arg2boolean IS_JENKINS_DEPLOY "${3}" "${IS_JENKINS_DEPLOY}"
 GDAL_VERSION="2.0.0"
 GDAL_FILE="gdal-$GDAL_VERSION.tar.gz"
 GDAL_DOWNLOAD_URL="http://download.osgeo.org/gdal/$GDAL_VERSION/$GDAL_FILE"
-GEOSERVER_VERSION="2.9.0"
+GEOSERVER_VERSION="2.9.1"
 GEOSERVER_FILE="geoserver-$GEOSERVER_VERSION-war.zip"
 GEOSERVER_DOWNLOAD_URL="http://sourceforge.net/projects/geoserver/files/GeoServer/$GEOSERVER_VERSION/$GEOSERVER_FILE"
 GEOSERVER_SHELL_VERSION="0.2.1"