Merge branch 'release/3.19' into develop
more love to recent pythons
Make things quiet only if told so.
small string typo.
Implement ARCH Linux package management stack.
get the sparks version in the TEST fabric target.
Factorize some remote and local configuration methods, add some is_* shortcuts and make them dynamic.
Start the debian/ubuntu/arch differentiation.
fix the version import.
Variable/string typo.
Add more is_* facilities methods.
Convert most of apt_* into pkg_* so that it works on Arch for what can.
Implement more ArchLinux switches in the generic package stack.
arch-related typo fixes and additions.
variable name typo.
adapt libmemcached dependancy for ArchLinux.
More ArchLinux adaptation (PG, git…).
FreeBSD OS detection.
Start of freebsd integration, and DEB/Arch/OSX refactoring.
Split dev_web() into web_nodejs() and web_ruby(), refactor/adapt for Arch/BSD.