After the Deadline: update autosave handling
Props @azaozz

See #38 and original trac ticket:
https://plugins.trac.wordpress.org/ticket/2145
After the Deadline: remove empty files

Props @azaozz
These files are no longer necessary since 92bbbd0099639d6205994d89333ada6a571d967c

See #38 for more details
Merge pull request #191 from jeherve/2145-trac

After the Deadline: update autosave handling