fixes:

initializer cannot fail
reachabilityForLocalWifi does not work
stopNotifier/startNotifier problem

Reachability.swift

@@ -86,19 +86,19 @@ public class Reachability: NSObject {
 
     // MARK: - *** Initialisation methods ***
     
-    required public init?(reachabilityRef: SCNetworkReachability?) {
+    required public init(reachabilityRef: SCNetworkReachability) {
         reachableOnWWAN = true
         self.reachabilityRef = reachabilityRef
     }
     
-    public convenience init?(hostname: String) {
+    public convenience init(hostname: String) {
         
         let nodename = (hostname as NSString).UTF8String
         let ref = SCNetworkReachabilityCreateWithName(nil, nodename)
         self.init(reachabilityRef: ref)
     }
 
-    public class func reachabilityForInternetConnection() -> Reachability? {
+    public class func reachabilityForInternetConnection() -> Reachability {
 
         var zeroAddress = sockaddr_in()
         zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
@@ -111,14 +111,14 @@ public class Reachability: NSObject {
         return Reachability(reachabilityRef: ref)
     }
 
-    public class func reachabilityForLocalWiFi() -> Reachability? {
+    public class func reachabilityForLocalWiFi() -> Reachability {
 
         var localWifiAddress: sockaddr_in = sockaddr_in(sin_len: __uint8_t(0), sin_family: sa_family_t(0), sin_port: in_port_t(0), sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
         localWifiAddress.sin_len = UInt8(sizeofValue(localWifiAddress))
         localWifiAddress.sin_family = sa_family_t(AF_INET)
 
         // IN_LINKLOCALNETNUM is defined in <netinet/in.h> as 169.254.0.0
-        let address: Int64 = 0xA9FE0000
+        let address: UInt32 = 0xA9FE0000
         localWifiAddress.sin_addr.s_addr = in_addr_t(address.bigEndian)
 
         let ref = withUnsafePointer(&localWifiAddress) {
@@ -152,7 +152,7 @@ public class Reachability: NSObject {
         if let reachabilityRef = reachabilityRef {
             SCNetworkReachabilitySetCallback(reachabilityRef, nil, nil)
         }
-        reachabilityRef = nil
+        notifierRunning = false
     }
 
     // MARK: - *** Connection test methods ***