Add mapfish print 2.1 version (4c469fe5a05f0047f31746470e2201c716d9a22c)
MapFish print: use 2.1 and delete 2.0
Merge pull request #637 from geoadmin/fix_print21

Add mapfish print 2.1 version (4c469fe5a05f0047f31746470e2201c716d9a22c)