Merge pull request #5 from Erutan409/add-variable-number-of-relays

Refactor of library

Updated types to be more explicit.

Updated code to reflect changes made in [Avail](Erutan409/Arduino-Avail@

4e65b94#diff-0f4fc0603099c81f85e23444484b2c3cR6)

Simple syntax update

Merge pull request #3 from Erutan409/safety_dev

Safety development

Update README.md