Remove Int NSTimeInterval helpers
Remove Int NSTimeInterval helpers

Double is IntegerLiteralConvertible, so 1.second, etc., still works
without the Int extension.
kostiakoval/SwiftyTimer,luzefeng/SwiftyTimer,dnsmob/SwiftyTimer,radex/SwiftyTimer,luzefeng/SwiftyTimer,kostiakoval/SwiftyTimer,uny/SwiftyTimer,dnsmob/SwiftyTimer,uny/SwiftyTimer,radex/SwiftyTimer