Add a migration for adding the deleted_at column to users.
Indicate deleted users in comments.
Reflow comment text.
Put user admin js in coffeescript instead.

Also clean up a few details. Add a (currently non-working) trash can.
Implement user deletion.
Ensure that deleted users are not sent emails.
Don't allow deleted users to log in.
Style fixes.
Indentation fix.
Switch to '$ ->' instead of $(document).ready
Don't disassociate authors when marking users as deleted.
Switch back to $(document).ready()
Merge pull request #395 from ooyala/deleted-users

Implement deleted users