fetch url and dump its content to stdout

fetch.swift

import Foundation
if C_ARGC < 2 { 
   println("\(C_ARGV[0]) url")
   exit(-1)
}
let url = NSURL.URLWithString(String.fromCString(C_ARGV[1]))
var enc:NSStringEncoding = NSUTF8StringEncoding
var err:NSError?
let content = 
    NSString.stringWithContentsOfURL(url, usedEncoding:&enc, error:&err)
if err {
   NSLog("error: %@", err!)
   exit(-1)
}
println(content)