Let lock to use redis_options method

[glasses618]

I encountered the same issue as #157 solved, but is for lock method.
I am not sure why #157 didn't let lock to use redis_options, but I think it should be.

This PR introduce redis_options on lock methods and add some test cases.
P.S. I didn't add test case on sorted_set because it didn't have any options yet.

redis-objects/spec/redis_objects_model_spec.rb

Lines 6 to 16 in 054c537

	class Roster
	include Redis::Objects
	counter :available_slots, :start => 10
	counter :pitchers, :limit => :max_pitchers
	counter :basic
	hash_key :contact_information, :marshal_keys=>{'updated_at'=>true}
	lock :resort, :timeout => 2
	value :starting_pitcher, :marshal => true
	list :player_stats, :marshal => true
	set :outfielders, :marshal => true
	sorted_set :rank

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