Adjustin capistrano to be able to deploy to AWS.
Syntax error fixed. Missing brackets.
Adding nil as default value for current_stage.
Config should be loaded before multistage:ensure

*  @mathieugilbert pointed out that we need to have the latest .env file
before we run multistage ensure because we load ENV vars into a config
object in our Capfile (used to load config for New Relic et al.)
* If it's not before multistage:ensure then it will always use the old
environment files in the config (i.e. if you change NEW_RELIC_KEY in
.env.staging then run bin/cap deploy it will use the old value and not
the new value you've changed it to)
Warn the user they are overwriting the server .env

* Make sure that people are aware they are overwriting the .env file on
the server
* At this point, the user should have answered Y to
environment:local:fetch_config so they will have the latest .env file
Merge pull request #2 from amaabca/aws-capistrano-deploy

Aws capistrano deploy