Fix the webapi decorators to properly preserve decorator state.
Review Request #4659 — Created Sept. 28, 2013 and submitted
Fix the webapi decorators to properly preserve decorator state.
This makes use of the new fixes in Djblets for webapi decorators to
preserve the response errors and not pollute the original functions.It also removes decorators that haven't been used in a very long time.
Verified that the responses were being set correctly.