Add extension methods for IReturns to allow specifying return values exceptions on async methods in a synchronous way.
Revert whitespace changes...
Added a few Unit Tests for ReturnsExtensions.ReturnsAsync. Tests for ThrowsAsync will follow.
More Unit Tests für ThrowsAsync extension methods.
Merge pull request #60 from Blewzman/master

Add extension methods for IReturns to allow specifying return values exceptions on async methods in a synchronous way