env-vars

Dead simple environment variable parser.

``
var env = require('env-vars')
var pgPassword = env.string('PGPASS')
var pgPort = env.integer('PGPORT', 5552)
`

API

- string(key[, defaultValue]): Returns a string for the given key. Fallsback to the
optional default value if the environment variable is not defined.
- boolean(key[, defaultValue]): Returns a boolean environment variable for the given key.
- number(key[, defaultValue]): Returns a number environment variable for the given key.
- integer(key[, defaultValue])`: Returns an integer environment variable for the given key.