Setting `KSToken` font property

[mohammedsafwat]

Hello! First, thanks for the nice library.

I was trying to figure out a way to set the font property on a KSToken instance, but unfortunately, I didn't find a way to do that. I see that you set the font to be the system font of size 14 inside the 'drawRect:' method and there's a check happening to see if the KSToken instance has a superview and if the superview is of type KSTokenField then you use the same font of this tokenField. In my case, I use the method addToken on my tokenView and by debuggin the superview property inside KSToken it returns another object, so the font in my KSToken instances and my KSTokenView are different. It would be nice if there's a setter method maybe to set the font on any KSToken instance. Thank you!