Merge with master

The deprecation of Python2.6 and the insertion of environments made it quite difficult to merge.

jedi/evaluate/compiled/getattr_static.py

@@ -89,7 +89,7 @@ else:
             return getattr(klass, '__dict__', _sentinel)
         return _shadowed_dict_newstyle(klass)
 
-    class _OldStyleClass():
+    class _OldStyleClass:
         pass
 
     _oldstyle_instance_type = type(_OldStyleClass())
@@ -124,7 +124,7 @@ def _safe_hasattr(obj, name):
 
 
 def _safe_is_data_descriptor(obj):
-    return (_safe_hasattr(obj, '__set__') or _safe_hasattr(obj, '__delete__'))
+    return _safe_hasattr(obj, '__set__') or _safe_hasattr(obj, '__delete__')
 
 
 def getattr_static(obj, attr, default=_sentinel):

jedi/evaluate/compiled/mixed.py

@@ -66,7 +66,7 @@ class MixedName(compiled.CompiledName):
         contexts = list(self.infer())
         if not contexts:
             # This means a start_pos that doesn't exist (compiled objects).
-            return (0, 0)
+            return 0, 0
         return contexts[0].name.start_pos
 
     @start_pos.setter