feat(semantic-release): implement for this formula

* Based on `ssf-formula` (v0.3.0)
  - https://github.com/myii/ssf-formula/pull/5
* Unable to use `pillar.example` directly for testing
  - Used it as a basis for `test/salt/pillar/default.sls`
  - Brought useful changes back to `pillar.example`
* Fix: avoid `users/googleauth.sls` for `RedHat` & `Suse`
* Close #203

test/integration/default/controls/config_spec.rb

@@ -0,0 +1,10 @@
+control 'users configuration' do
+  title 'should match desired lines'
+
+  describe file('/custom/buser') do
+    its('type') { should eq :directory }
+    it { should be_owned_by 'buser' }
+    it { should be_grouped_into 'primarygroup' }
+    its('mode') { should cmp '0750' }
+  end
+end