Added task to copy curated feeds
Added task to list curated feeds
Added task to create curated feeds
Added command to delete curated feeds
Added add/remove/list curated feed manager tasks
Added arg checks for CopyCuratedFeedTask
Merge branch 'anurse/curatedfeedmgmt' into dev

Conflicts:
	Source/NuGetGallery.Operations/NuGetGallery.Operations.csproj