iOS7: Allow users to set the Title Color of the Windows

We should allow users to set the Window titleColor without having to create a custom Label and setting it as the titleControl since you can do this natively (at least on Interface Builder).

Ideally, beside the navTintColor and the tintColor window parameters we should have a parameter called titleColor where the user can define the color for the title text on the NavBar.

Also we should map titleShadowColor, titleShadowOffset and titleFont for setting a title shadow color, offset and font as those are all available natively on IB.

Those are all supported natively on the Interface Builder and should be mapped to Ti.