resilient stack: use newer Jinja and slapos.recipe.template.

Also unpin slapos.Cookbook.
Related problem with Jinja2.7 has been fixed in slapos.recipe.template 2.5.

stack/resilient/buildout.cfg

@@ -121,11 +121,6 @@ mode = 0644
 find-links = http://www.nexedi.org/static/packages/source/rdiff-backup-1.3.4nxd2.tar.gz
 
 [versions]
-# Pin Jinja2 to 2.6, as 2.7 breaks current code
-Jinja2 = 2.6
-# ... And newer s.r.template requires Jinja2 >= 2.7
-slapos.recipe.template = 2.4.2
 rdiff-backup = 1.3.4nxd2
-slapos.cookbook = 0.92