added filepath.ToSlash() to the findRelevantStackFrame() so that assert errors are properly found on windows too
added filepath.ToSlash() to the findRelevantStackFrame() so that assert errors are properly found on windows too

runner-mei/revel,notzippy/revel,birkirb/revel,revel/revel,birkirb/revel,runner-mei/revel,revel/revel,notzippy/revel,birkirb/revel,notzippy/revel