Add methods to spyCall interface: callArgOn, callArgOnWith, yieldOn, yieldToOn
Bug fix for yieldTo arguments
Added unit tests for callArgOn, callArgOnWith, yieldOn and yieldToOn.
Fix wrong argument in test.
Changed whitespace formatting.
Added complete unit test cases.
Fix whitespace issue
More whitespace issues
Merge pull request #239 from MrBigDog2U/master

New spyCall methods