NSURL extension for common directory URLs

NSURL+StandardURLs.swift

import Foundation

/// abstract: Convenience methods for getting standard URLs

extension NSURL {

    /// The URL to the Documents directory
    static var documentsURL: NSURL {
        return try! NSFileManager.defaultManager().URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: true)
    }

    /// The URL to the caches directory
    static var cachesURL: NSURL {
        return try! NSFileManager.defaultManager().URLForDirectory(.CachesDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: true)
    }
    
}