NuGet/NuGetGallery — pull request #249 by Haacked (2011-11-17 22:18:13+00:00)
Title: Added UI to allow cancelling in-progress package uploads.

__NOTE: We just added the cancel button as a separate for and separate action method and styled it to look like a typical cancel link. We can improve this later if we need to, but it's good enough for now. :)__

This fixes issue #238. This allows the user to cancel a package upload
in progress. It simply deletes the package upload.

ET notes:
* Cancelling pending upload allows re-uploading same package
* Cancel pending upload, hit back button, cancel again. No error. Takes user
to the upload page.
* Verify upload, hit back button, try canceling, just takes user to upload page.