NotBeDecoratedWith and ThatAreNotDecoratedWith

[jnyrup]

This closes #527

• The Pull Request is targeted at the master branch.
• The code complies with the Coding Guidelines for C# 3.0, 4.0 and 5.0/.
• The changes are covered by a new or existing set of unit tests which follow the Arrange-Act-Assert syntax such as is used in this example.
• If the contribution affects the documentation, please include your changes to documentation.md in this pull request so the documentation will appear on the website.

[dennisdoomen]

The release notes for v5 will be huge if you continue like this ;-)

[jnyrup]

I think I've covered most of my primary list, but I'd be surprised if I didn't find some more methods to submit negations of.