* Semi-automated using `ssf-formula` (v0.5.0)
* Fix errors shown below:

```bash
users-formula$ $(grep "\- yamllint" .travis.yml | sed -e "s:^\s\+-\s\(.*\):\1:")
./users/defaults.yaml
  4:1       warning  missing document start "---"  (document-start)
  5:20      warning  truthy value should be one of [false, true]  (truthy)
  8:21      warning  truthy value should be one of [false, true]  (truthy)
  9:15      warning  truthy value should be one of [false, true]  (truthy)
  10:1      error    too many blank lines (1 > 0)  (empty-lines)

pillar.example
  5:20      warning  truthy value should be one of [false, true]  (truthy)
  14:13     warning  truthy value should be one of [false, true]  (truthy)
  16:13     warning  truthy value should be one of [false, true]  (truthy)
  19:13     warning  truthy value should be one of [false, true]  (truthy)
  23:13     warning  truthy value should be one of [false, true]  (truthy)
  25:5      error    wrong indentation: expected 6 but found 4  (indentation)
  37:23     warning  truthy value should be one of [false, true]  (truthy)
  40:21     warning  truthy value should be one of [false, true]  (truthy)
  41:20     warning  truthy value should be one of [false, true]  (truthy)
  42:13     warning  truthy value should be one of [false, true]  (truthy)
  47:17     warning  truthy value should be one of [false, true]  (truthy)
  51:19     warning  truthy value should be one of [false, true]  (truthy)
  52:23     warning  truthy value should be one of [false, true]  (truthy)
  53:20     warning  truthy value should be one of [false, true]  (truthy)
  54:21     warning  truthy value should be one of [false, true]  (truthy)
  58:15     warning  truthy value should be one of [false, true]  (truthy)
  59:15     warning  truthy value should be one of [false, true]  (truthy)
  73:18     warning  truthy value should be one of [false, true]  (truthy)
  75:20     warning  truthy value should be one of [false, true]  (truthy)
  90:7      error    duplication of key "privkey" in mapping  (key-duplicates)
  91:7      error    duplication of key "pubkey" in mapping  (key-duplicates)
  117:44    warning  too few spaces before comment  (comments)
  125:27    warning  truthy value should be one of [false, true]  (truthy)
  153:17    warning  truthy value should be one of [false, true]  (truthy)
  167:13    warning  truthy value should be one of [false, true]  (truthy)
  171:16    warning  truthy value should be one of [false, true]  (truthy)
  172:89    error    line too long (102 > 88 characters)  (line-length)
  177:89    error    line too long (102 > 88 characters)  (line-length)
  178:89    error    line too long (100 > 88 characters)  (line-length)
  181:89    error    line too long (94 > 88 characters)  (line-length)
  188:13    warning  truthy value should be one of [false, true]  (truthy)
  189:12    warning  truthy value should be one of [false, true]  (truthy)
  190:12    warning  truthy value should be one of [false, true]  (truthy)

test/salt/pillar/default.sls
  25:89     error    line too long (91 > 88 characters)  (line-length)
  175:89    error    line too long (102 > 88 characters)  (line-length)
  180:89    error    line too long (102 > 88 characters)  (line-length)
  181:89    error    line too long (100 > 88 characters)  (line-length)
  184:89    error    line too long (94 > 88 characters)  (line-length)
```

* 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