[blacksmith] Bump version to 1.3.1
Merge branch 'master' of github.com:sensu/sensu-puppet
Update sensu_gem provider

* Added the feature install_options to the provider.
* Updated package install to use the sensu_gem provider if using
  the embedded ruby.
Adds puppetforge version number

It is nice when the readme links to the puppetforge and shows the latest forge version. 
This adds a puppet forge badge, similar to the travis build status badge.
Merge pull request #277 from adamcrews/sensu_gem_provider

Update sensu_gem provider
Merge pull request #278 from spuder/patch-1

Adds puppetforge version number
Merge branch 'master' of github.com:sensu/sensu-puppet