add expiration and expireat to Value, List and Set.
fix README
fix README
fix README
add expiration and expireat to Redis::HashKey
update README
add model test
fix bug that cannot update expiration when unshift to lists
add expiration option to Redis::Counter
remove Gemfile.lock
add expiration and expireat to Value, List and Set.
fix README
fix README
add expiration and expireat to Redis::HashKey
update README
add model test
fix bug that cannot update expiration when unshift to lists
add expiration option to Redis::Counter
rebase to upstream master
Merge branch 'master' of github.com:cctiger36/redis-objects

Conflicts:
	.gitignore
	Gemfile
	README.rdoc
	lib/redis/base_object.rb
	lib/redis/value.rb
	spec/redis_objects_instance_spec.rb
	spec/redis_objects_model_spec.rb