Allow custom  styling at IB without sublclassing

Here is example of how to move controls to IB outlets. With such way you can totally customise cells with type of "Custom" - textLabel and etc.

P.S.: that's not fully tested, consider it as "example" of implementation. Work is still in progress. 

P.P.S.: You can't do too much with default styles of cells without any subclassing, e.g. positing or use few labels (attributedText) per row with differ fonts.

I'm really hope that you will add such features, because in our case - we let our designer to design all visual parts and that's almost impossible, if we need to tune code too (E.g., "Hey, put that label 10 points down...hey, now move it 5 points left")

#166