OAuth is "An open protocol to allow secure API authentication in a simple and
standard method from desktop and web applications."

In practical terms, OAuth is a mechanism for a Consumer to request protected
resources from a Service Provider on behalf of a user.

Please refer to the OAuth spec: http://oauth.net/documentation/spec

Net::OAuth provides:
* classes that encapsulate OAuth messages (requests and responses).
* message signing
* message serialization and parsing.
* 2-legged requests (aka. tokenless requests, aka. consumer requests),
see "CONSUMER REQUESTS"

Net::OAuth does not provide:
* Consumer or Service Provider encapsulation
* token/nonce/key storage/management