Allow user to override deploy-user's homedir.

Allow the customer to override the deploy-users home-directory via
node[:opsworks][:deploy_user][:home].

This was requested by github.com/till, that uses nginx's www-data user
as deploy-user. Due to the cookbook execution order the www-data user
is not present yet, when the app is deployed.
when updating dependencies look for updates of ruby and nodejs too and run the respective recipes.
updates of nodejs are also triggered by missing packages, not only binaries.
Installing nodejs will trigger removal of old pacakges first.
updates of ruby are also triggered by missing packages, not only binaries.

Conflicts:
	ruby/recipes/default.rb