Upgraded ImageIO-Ext version from 1.1.9 to 1.1.10
Merge pull request #597 from n-lagomarsini/GEOS-6499

[GEOS-6499] Upgrade ImageIO-Ext version from 1.1.9 to 1.1.10 on GeoServer.
Merge branch 'master' of git://github.com/geoserver/geoserver