cassettes               List cassettes, get current cassette, etc.
insert_example_cassette
                        Use cassettes in examples
is_recording            Determine if vcr is recording/replaying
lightswitch             Turn vcr on and off
setup_knitr             Use vcr in vignettes
use_cassette            Use a cassette to record HTTP requests
vcr_configure           Global Configuration Options
vcr_configure_log       Configure vcr logging
vcr_last_request        Retrieve last vcr request/response
vcr_test_path           Locate file in tests directory
