Moved all tests verifying failure messages to ShoudlyMessage class
Issue #51 Remove dependency on Rhino.Mocks
Refactoring ShouldlyMessageTests
Issue #46 - Deprecate ShouldBeCloseTo

ShouldBeCloseTo has been deprecated because it's poorly named. The
  spunkier (and terse) "ShouldContainWithoutWhitespace" supercedes
  our old ShouldBeCloseTo friend.
Issue #53 Add ShouldBe with tolerance overrides for decimal values