Failing unit tests for issue #70
Fixes issue EquivalentTo isn't compatible with IgnoreCase for dictionaries
Switched the tolerance for dictionary key comparison to new Tolerance(0) from Tolerance.Empty so that numerics do not take the default system tolerance. Added tests for non-generic IDictionaries and fixed those in NUnitEqualityCompare.
Merge pull request #98 from nunit/issue-70

Issue 70