Added error handling to (ghetto-timemachine.rb) mkdir, rmdir, mvdir and soft_link for non-ssh backups.
Error handling already existed for ssh based backups. This fix should address the following:
Identified a bug where FileUtils.rm_rf was failing due to a permissions problem. The failure wasn't trapped
     and resulted in a directory recursion that would keep compounding over time (thus eating up disk space and inodes)

     Resulting in this kind of tree
       sunday
          mhanby
          saturday
       monday
          mhanby
          sunday
       tuesday
          mhanby
          monday