Issue #224 : update SmartOS installation procedure

This fix intend to resolve the Issue #224.

* Make use of 2013Q2 package set from Joyent : this would require
a recent image of SmartOS
* NO compat with previous 2013Q1 and before
* Tested with 'stable' version of Salt (provided by Joyent : 0.15) on a global zone.
* As git can't be installed on the global zone via pkgin, 'git develop' version is currently broken on a global zone.
* Should be working on a VM / Zone (not yet tested)