Better UX for failed package edits. Successful package edits delete any failed pending edits for that package. Failed package edits are represented as such to the package owner. Untested.
Merge remote-tracking branch 'origin/tilovell/1541-betterFailedEditUX'

Conflicts:
	src/NuGetGallery.Operations/Tasks/HandleQueuedPackageEditsTask.cs
Merge branch 'master' of https://github.com/NuGet/NuGetGallery