* Automated using https://github.com/myii/ssf-formula/pull/374
* Automated using https://github.com/myii/ssf-formula/pull/292
* Automated using https://github.com/myii/ssf-formula/pull/163
* Checked using https://github.com/myii/ssf-formula/pull/132
* Automated using https://github.com/myii/ssf-formula/pull/79
Add gitignore, kitchen-ci files Add some tests and documentation