added error queue attribute on push queue table
Merge pull request #352 from iron-io/error_queue_doc

added error queue attribute on push queue table
Scheduled Task Frequency renaming and clarification
added "build" keyword to table of .worker keywords for node.js build
Merge pull request #353 from iron-io/remote_build_node

added remote build node.js
codeigniter libraries to mq, worker, cache. "thanks" into "by"
Merge pull request #354 from iron-io/codeigniter

codeigniter libraries to mq, worker, cache. "thanks" into "by"
added instructions on npm init and npm install <module name> --save