Corrected mistakes

boards/utils.py

@@ -13,7 +13,7 b' from django.template.defaultfilters impo'
 from django.utils import timezone
 from django.utils.translation import ugettext_lazy as _
 import magic
-from portage import os
+import os
 
 import boards
 from boards.settings import get_bool

boards/views/all_threads.py

@@ -1,4 +1,3 b''
-from dbus.decorators import method
 from django.core.urlresolvers import reverse
 from django.core.files import File
 from django.core.files.temp import NamedTemporaryFile