use universal-newline in pickleshare

This prevents entries (bookmarks) made in 0.11 on Windows from
having an extra '\r' on all strings.

closes gh-971

IPython/utils/pickleshare.py

@@ -67,7 +67,7 b' class PickleShareDB(collections.MutableMapping):'
             return self.cache[fil][0]
         try:
             # The cached item has expired, need to read
-            obj = pickle.load(fil.open("rb"))
+            obj = pickle.loads(fil.open("rbU").read())
         except:
             raise KeyError(key)