 UUIDTools was designed to be a simple library for generating any
 of the various types of UUIDs.  It conforms to RFC 4122 whenever
 possible.

== Example
  UUID.md5_create(UUID_DNS_NAMESPACE, "www.widgets.com")
  => #<UUID:0x287576 UUID:3d813cbb-47fb-32ba-91df-831e1593ac29>
  UUID.sha1_create(UUID_DNS_NAMESPACE, "www.widgets.com")
  => #<UUID:0x2a0116 UUID:21f7f8de-8051-5b89-8680-0195ef798b6a>
  UUID.timestamp_create
  => #<UUID:0x2adfdc UUID:64a5189c-25b3-11da-a97b-00c04fd430c8>
  UUID.random_create
  => #<UUID:0x19013a UUID:984265dc-4200-4f02-ae70-fe4f48964159>
