[GEOS-6603] Add a button for disabling native warp
Upgrade GWC dependency to 1.7-SNAPSHOT
[GEOS-6627]GWC causes a wrong handling of the ImageIO and ImageIO-Ext plugins

Conflicts:

	src/pom.xml
[GEOS-6628] NullPointerException when setting empty ParameterFilter
Merge pull request #675 from n-lagomarsini/GEOS-6603

[GEOS-6603] Add a button for disabling native warp
Merge pull request #686 from n-lagomarsini/GEOS-6627

[GEOS-6627] GWC causes a wrong handling of the ImageIO and ImageIO-Ext plugins
Merge pull request #687 from n-lagomarsini/GEOS-6628

[GEOS-6628] NullPointerException when setting empty ParameterFilter
Merge branch 'master' of git://github.com/geoserver/geoserver