Update the backup script

We have proper install instructions now!
Fix the backup script up a bit

Turns out we don't want to pass --soft when reset'ing from the backup. Also,
the exclude list needed updating.
Fix a small typo
Fixing up the dh-newuser script a little

The reinstaller and remake-daily scripts need to be fixed to work with this,
but I'll take care of those in separate pull requests.
Merge pull request #12 from Sophira/newuser-changes

Fixing up the dh-newuser script a little
Merge pull request #10 from Sophira/backup-changes

Changes for backup script