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.
 +- Added an `in` test that works like the in operator.  This can be used
 +  in combination with `reject` and `select`.
 +
  Version 2.9.5
  -------------
- (bugfix release, no release date yet)
+ (bugfix release, released on January 28th 2017)
  
  - Restored the original repr of the internal `_GroupTuple` because this
    caused issues with ansible and it was an unintended change.  (#654)