Don't unicode encode unicode strings.
Don't unicode encode unicode strings.

Re-added my changes that only unicode encodes note contents or tags if
they are normal strings, and not unicode already.

Before these two checks, I'd get tracebacks like these:

    File "nvpy/nvpy.py", line 231, in __init__
      self.sync_full()
    File "nvpy/nvpy.py", line 519, in sync_full
      sync_from_server_errors = self.notes_db.sync_full()
    File "nvpy/notes_db.py", line 386, in sync_full
      uret = self.simplenote.update_note(n)
    File "nvpy/simplenote.py", line 119, in update_note
      note["content"] = unicode(note["content"], 'utf-8')
    TypeError: decoding Unicode is not supported

trankmichael/nvpy,dwu/nvpy,yuuki0xff/nvpy,n8henrie/nvpy,dwu/nvpy,khornberg/nvpy-gtk,yuuki0xff/nvpy,bwillistower/nvpy