Add DEDENT_CLOSING_BRACKETS

This allows for PEP8-compatible JSON-style scope organization that has the
following properties:

* produces smaller diffs
* uniformly treats all closing brackets, including function definitions,
  calls and data structures
* leaves more space on the line by solving the PEP8 violation known as
  "continuation line with same indent as next logical line" without
  additional indentation
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 7d31575..62e2a5f 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -12,3 +12,4 @@
 Bill Wendling <[email protected]>
 Eli Bendersky <[email protected]>
 Sam Clegg <[email protected]>
+Łukasz Langa <[email protected]>