Updated fog to 1.11.1
file.url is not defined for some fog providers such as HP; they will use public_url instead; file.destroy throws a NotFound error for some providers
Created create_app_package method to avoid code duplication; tested AppPackage#package_uri - file.url/public_url
Added tests for Staging#delete_droplet to ensure proper deletion when using different Fog providers
Merge branch 'master' of git://github.com/anynines/cloud_controller_ng into anynines-master

Conflicts:
	spec/app_stager_spec.rb