Move instance-erp5-production.cfg.in rendering to slapgrid-cp time.

In preparation for better ERP5 clusterisation.
Add 6tunnel support.

Based on work by Romain Courteaud <romain@nexedi.com>.
Add support for non-string storage definition.

In preparation for better ERP5 clusterisation.
version up : SQLite 3.7.14.
Bump zc.buildout version.
Actually bump slapos.buildout in slapos "client-side" common file.

This was intended in 795cedc, but it should not be needed to revert there.
Merge branch 'master' into erp5-component

setup.py has been sorted alphabetically prior the merge.

Conflicts:
	component/slapos/buildout.cfg
	setup.py
	stack/slapos.cfg
Switch slapos.cookbook branch
Fix promise
(cherry picked from commit d666f259ddcdb3d9360ef7ee72306cbab8c2212d)
Use gitclone home-made recipe.
Update dependency
groonga needs zlib
Update libnetworkcache version
add missing pkgconfig path.
add missing pkgconfig path.
add missing pkgconfig path.
version up : libxml2 2.9.0 and libxslt 1.1.27.
version up : cmake 2.8.9.
version up : fontconfig 2.10.1.
version up : freetype 2.4.10.