Unit tests
Creates unit tests for R00-Utilities and Operators, R01-Inputs and Outputs, and R02-Files and Paths. Fixes minor typos in R00, R01, and R02. Adds httptest package to use mocking capabilities for unit testing.
Creates unit tests for R00-Utilities and Operators, R01-Inputs and Outputs, and R02-Files and Paths. Fixes minor typos in R00, R01, and R02. Adds httptest package to use mocking capabilities for unit testing.