Merge branch '2.9-maintenance'

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  Jinja2 Changelog
  ================
  
 +Version 2.10
 +------------
 +(feature release, release date to be decided)
 +
 +- Added a new extension node called `OverlayScope` which can be used to
 +  create an unoptimized scope that will look up all variables from a
 +  derived context.
 +
+ Version 2.9.5
+ -------------
+ (bugfix release, no release date yet)
+ 
+ - Restored the original repr of the internal `_GroupTuple` because this
+   caused issues with ansible and it was an unintended change.  (#654)
+ 
  Version 2.9.4
  -------------
  (bugfix release, released on January 10th 2017)