Update README.md

error #473: changed mongodb to sql
fix undefined arguments code logic
fixing ordering of Peristent store init to ensure store is available for initializeFile
change redis package
refactor to use node_redis and fix empty directives
changed ready event listner
add support for store/redis options.url
fix issue with db.auth
fix issue with redis.get handling of non-string IDs
fix issue with store/redis ready being resolved twice
fixing ordering of Peristent store init to ensure store is available for initializeFile
fix undefined arguments code logic
update mongodb package location, deal with empty query, add default port and write notification
add direct access to collection for MongoDB
expose collection
Use correct name property to correspond with formidable
Don't cache get's that return undefined
Merge pull request #50 from kriszyp/master

Fixes for cache store
bump version
Make expiration properties hidden and prefixed