Refactoring

+ Extracted a number of partial classes from the `ControllerResultTest` class.
+ Extracted a number of partial classes from the `ControllerResultTestTests` class.
+ Included *solution specific* Resharper settings (*TestStack.FluentMVCTesting.sln.DotSettings* file) that disable namespace warnings. 
+ Removed some whitespace and obsolete using directives here and there.

~~I have not touched the "OldMvc" folder but it looks buggered. I want to see what the CI says.~~ After doing a `git clean` it looks ... clean. No worries there after all.