Added `BadPackages` library
Removed `Zero` library - No longer needed

- Thank you Aura Monad
User will now be warned of "known bad packages"

- "Known bad packages" are those listed in #14 as packages known
  to fail at building. The user will be asked if they want to
  try building anyway (hacking with `--hotedit` could fix things).
Made `optionalPrompt` easier to call
Errors caused by lack of net connection now fail nicely
Updated completion files to show newest options
New option `--aurignore`

- Must be used like this:
    aura -A foo --aurignore=bar
    aura -A foo --aurignore=bar,baz,bin,biff,bidoof
Added `--aurignore` to completion scripts and man page
Updated PKGBUILD and aura.cabal
Wrote 1.1's release announcement
Moved a few files around