Document Cache CAS
Merge pull request #301 from iron-io/cache-cas

Document Cache CAS
Updated worker api, added "config" parameter.
Update supported beanstalk commands
Merge pull request #302 from iron-io/update-beanstalk

Update supported beanstalk commands
adds TOC; adds new documentation
adds more local run docs (IW CLI)
updates .worker doc
updates mq docs
removes odd line from config file
updates go examples for mq using iron_go lib
adds node.js examples to iron mq overview
adds runtimes to .worker
adds integration page for IW
fixes typo
adds queues attributes to mq env
small upd
updates env for mq
updates documents based on Paddys comments