Month View and support for width > 320pt

[maggix]

The current month calendar controller does not support a screen width larger than 320 points.
As an example, this is what happens when you add a LaunchImage for the new iPhone 6 (and iPhone 6 Plus) to the Demo app, so that iOS enables full resolution for the application:

[maggix]

Hello everyone, I tried a workaround and it worked: I defined a scale factor for all sizes in TKCalendarMonthView.m using 320 as a baseline.
The result (on iPhone 6 at 750px) is attached. I manage a fork of this repository at this address where I work on a iOS7/iOS8-styled version.