Ability to show only the days in the current month, resolved deprecation warnings for iOS 7.0 target

I've made a couple of changes, please review.

Summary -
Setting pmCC.showOnlyCurrentMonth = YES allows to present the user with only the current days of the month. 

![screen shot 2014-04-01 at 14 33 42](https://cloud.githubusercontent.com/assets/2040617/2579538/86b65248-b9a2-11e3-8b89-28027229a9ef.png)

Also resolved two deprecation warnings for iOS 7.0 targets