Create Version5 class

- rspec not loading ./lib/sro/uuid/version5.rb
Configure app to load Ruby files in /lib
(green) Make test pass => Sro::Uuid::Version5#timestamp returns a
UUIDTools::UUID object
(red) Write failing test => Sro::Uuid::Version5#mac_address retrieves
computers mac address
(green) Write failing test => Sro::Uuid::Version5#mac_address
retrieves computers mac address
Refactor test for Uuid:Version5.new.timestamp
(red) Write failing test => Sro::Uuid::Version5#version5 generates a
Version 5 UUID
(green) Make test pass => Sro::Uuid::Version5#version5 generates a
Version 5 UUID
(red) Write failing test => Sro::Uuid::Version5#run returns a uuid
(green) Make test pass => Sro::Uuid::Version5#run returns a uuid
(red) Write failing test => Sro::Uuid#pattern matches the pattern
(green) Make test pass => Sro::Uuid#pattern matches the pattern
Refactor test for Uuid::Version5#run
(red)  Write failing test => Sro::Uuid#version5 matches the pattern
(green)  Write failing test => Sro::Uuid#version5 matches the pattern
Create sro.gemspec, and other files for publishing gem