Merge branch 'master' into develop
0.1.2git
use `lsb_release` to get platform information.

(1) reimplement `platform.identifier()` with using `lsb_release`
(2) add `platform.release()` and `platform.codename()`
enable pubkey authentication on tests
check package status before installation in packages.install().
if you prefer skip this checking, use packages.install!() instead.
remove useless development dependencies
do not install lsb packages on :load of recipe.
version up vagrant; 1.0.6 -> 1.1.x
release 0.1.2
Merge branch 'release-0.1.2'