translations for gsk tooltip
added gsk model class and mako
Use 301 redirection instead of 302 for SEO
Merge pull request #1024 from geoadmin/gal_redirect_movepermanently

Use 301 redirection instead of 302 for SEO
Merge pull request #1021 from geoadmin/data_gsk_tooltip

Data gsk tooltip
Extension of mapproxy to support new projections,
layers and services (WMTS)
updating for DB table change and new cleanup up apache entries
correcting mapproxy according to feedback:

- improving documentation and README for mapproxy
- removing OSM layers from config
- coping with empty parts in template
- adding missing projections in WMS
- 'default' rewrite rule for all environnment
optimized apache settings
only requesting the needed tiles
IGN performance optimization