Redis connection for heroku

Slight improvement of error reporting for Redis and Memcached connections on web nodes. Fixed a little bug too.

Adding dependcies for the nodetime addon.

Adding nodetime addon code to worker and web nodes (as per the docs https://devcenter.heroku.com/articles/nodetime).

Adding support for the NodeFly Heroku addon.

Adding support for orderby on spreadsheets.

Changing default NODE_ENV on worker process

Adding nice bertha favicon

Adding temporary fix for parsing columns with JSON and two dimensional arrays.

Adding a map column parser/function.

Correctly handle null values.

CORS headers on 304 responses. wildcard CORS host.

Adding new ImpPlugin. This plugin processes Interactive Multimedia Presentations.

Convert sheet to a map/dictionary.

Updating Node and NPM versions because of a bug in Node
    https://github.com/joyent/node/issues/4771