Applies fixes for ARC from patch manually—could use some testing
Adding method to get the week number of a date
Adapting merged pull request to use static _calendar
Added year, hour, minute methods
added a utc timestamp
fixed the utcTimestamp
DRYs up use of initializeStatics (use +sharedCalendar and +sharedDateFormatter instead of _calendar, etc)
Use abbreviate week day
Add podspec