Update Vagrantfile

Updated for the installation of curl and omnibus automatically for Ubuntu.
bumped default version of sensu to 0.11.3-1
Merge pull request #190 from portertech/sensu-0.11.3-1

bumped default version of sensu to 0.11.3-1
Merge pull request #188 from jjasghar/patch-1

Update Vagrantfile
updated vagrantfile, new base boxes, improved install chef
Merge pull request #191 from portertech/vagrantfile

updated vagrantfile, new base boxes, improved install chef
minor version bump
bumped default version of sensu to 0.12.0-1
Merge pull request #192 from portertech/sensu-0.12.0-1

bumped default version of sensu to 0.12.0-1
minor version bump
add test-kitchen
include self in Cheffile
add test-kitchen to chefignore
[runit] adding sensu.use_embedded_runit attribute
[runit] adding sensu.embedded_directory attribute
[runit] adding lwrp for enabling/disabling services via embedded runit
[runit] updating service recipes to make use of embedded runit
[runit] ensuring init scripts from package are replaced with symlinks to embedded sv binary
[runit] prefer sensu_ctl configured? over initctl status
[runit] reinstate /etc/default/sensu when using embedded runit