[xmlunit/xmlunit.net] be04b0: push placeholder stuff to 2.6.0

[GitHub <no...@gi...>]

  Branch: refs/heads/master
  Home:   https://github.com/xmlunit/xmlunit.net
  Commit: be04b091c1eb4220c1dfdcab3ee534683df637bb
      https://github.com/xmlunit/xmlunit.net/commit/be04b091c1eb4220c1dfdcab3ee534683df637bb
  Author: Stefan Bodewig <ste...@fr...>
  Date:   2017-10-20 (Fri, 20 Oct 2017)

  Changed paths:
    M RELEASE_NOTES.md
    M src/main/net-placeholders/IPlaceholderHandler.cs
    M src/main/net-placeholders/IgnorePlaceholderHandler.cs
    M src/main/net-placeholders/PlaceholderDifferenceEvaluator.cs
    M src/main/net-placeholders/PlaceholderSupport.cs

  Log Message:
  -----------
  push placeholder stuff to 2.6.0

I plan to cut 2.5.1 with the fix for #22, the placeholders module will
be part of the source tarballs but I won't publish the nuget packages.