remove Question dependency on env

* Question was setting itself to the env but env itself persists it
* Env#fetch saves everyting that responds to #call by set
Merge pull request #1179 from betesh/master

made the deploy.rb template show better examples of how to set linked_dirs and linked_files.  refs #922
Merge pull request #1177 from mikz/remove-question-env

remove Question dependency on env
Make on() use a deep copy of the hosts