Straight copy of mongo-livedata -> redis-livedata
Repoint redis-livedata -> npm redis, rename some mongo-named files
Rename Meteor.Collection -> Meteor.RedisCollection

At least for now; we might well tweak this later
Rename collection.js -> redis_collection.js (and tests)
Rename MongoInternals -> RedisInternals
Rename MongoTest -> RedisTest