Ran 2to3 on pillar + some manual fixups

The 'manual fixups' are:

- incorrect use of dict.items() where dict.iteritems() was meant; this
  results in list(dict.items()), which I changed to dict.items().
- removal of 'from __future__ import' lines, which 2to3 changes into
  empty lines; I removed the empty lines.

pillar/markdown.py

@@ -3,8 +3,6 @@
 This is for user-generated stuff, like comments.
 """
 
-from __future__ import absolute_import
-
 import bleach
 import CommonMark