closed #18 client authentication
closed #18 client authentication : test comment updates
closed #18 client authentication : updates per review comments
Merge branch 'master' of https://github.com/TargetRAD/radbus-api into feature-18-client-authentication
prepend env variables with RADBUS_
rename test-api-key to test-server
Merge pull request #29 from smcadams86/feature-18-client-authentication

closes #18 client authentication