ReleaseNoteContentToBeInsertedWithinNuspecFile.txt

New feature(s):
* Numbers: introduce IsPositiveOrZero() check.
* Numbers: introduce IsNegativeOrZero() check.
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Change(s):
* Numbers: introduce IsStrictlyPositive() as a substitute for IsPositive() which is now obsolete.
* Numbers: introduce IsStrictlyNegative() as a substitute for IsNegative() which is now obsolete.
* Numbers: introduce IsStrictlyGreaterThan() as a substitute for IsGreaterThan() which is now obsolete.
* Numbers: introduce IsStrictlyLessThan() as a substitute for IsLessThan() which is now obsolete.
* Improve error messages (consistency and relevance).
* Check.ThatCode(...).Throws<T>() now requires T to be an exception. This restriction ensures only Exceptions are proposed in autocompletion.
* Simplify the way you can extend NFluent by adding your own checks. Now, you can call: var checker = ExtensibilityHelper.ExtractChecker(check);  at the beginning of your check extension method, and then rely on its ExecuteCheck() or BuildMessage() helper methods to do the job. Note: the Checker is part of the NFluent.Extensibility namespace.

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Bug Fixe(s):
* Fix the inversion between expected and actual error message for the .WithMessage checks on exception.
* Fix the issue with null value on Check.That(...).IsBefore(...).