Fix a bug with listeners and add lru-cache libs
Add LRU cache for tokens
Expose LRU cache for workers
Add waterfall
Use setMaxListeners instead of removeAllListeners
Add a comment to describe what is length and max in LRU cache
Add a comment to explain delete job.data
Update README to explain what is job.cache
Add a comment about setMaxListeners
Update index.js
Merge pull request #17 from AnyFetch/lru

Add LRU