Lh 3624

Added newrelic deployment hook

extra parameters can be sent:
deployment[app_name]	        The name of the application, found in the newrelic.yml file
deployment[application_id]	The ID # of the application
deployment[description]    	Text annotation for the deployment — notes
deployment[revision]	        The revision number from your source control system (SVN, git, etc.)
deployment[changelog]	        A list of changes for this deployment
deployment[user]                    The name of the user/process that triggered this deployment

In order for the Hook to work you have to add the :newrelic recipe to the user_recipes on the Capfiles of the projects.

This was tested using my_ama pointing the gem to the github branch
    gem 'capistrano-deploy', github: 'amaabca/capistrano-deploy', branch: 'LH-3624'
there is a branch on my_ama (LH-3624) that you can use for testing.