Fix #1464 Add a cancel button to the 'Edit Package' page, which takes you back to DisplayPackage. Styled same as on the Delete Package page.
Move the note about Package Id, Versions, etc below the submit buttons, since it's not really that important.
Some spacing tweaks on edit/verify package page.
Merge pull request #1500 from NuGet/tilovell/1464-AddCancelButtonOnEditPackagePage

Fix 1464 add cancel button on edit package page