Merge branch 'feature/prepare-for-2.5.0' into 'releases/2.5'

dune.module: prepare for 2.5.0 release

See merge request !138

dune.module

 Module: dune-grid
-Version: 2.5-git
+Version: 2.5.0
 Maintainer: dune-devel@dune-project.org
-Depends: dune-geometry (>= 2.5)
+Depends: dune-geometry (>= 2.5.0)
 Suggests: dune-uggrid
 Whitespace-Hook: Yes