Optimised returns and small changes
Optimised returns and small changes

Removed unused directives
Changed SetCallBack to SetNotification
Altered the string test in IsHostReachable to use string.IsNullOrEmpty
Simplified returns in IsAdHockWifiNetworkAvailable and
IsNetworkAvailable

nervevau2/monotouch-samples,haithemaraissia/monotouch-samples,andypaul/monotouch-samples,nelzomal/monotouch-samples,nervevau2/monotouch-samples,sakthivelnagarajan/monotouch-samples,iFreedive/monotouch-samples,kingyond/monotouch-samples,nelzomal/monotouch-samples,robinlaide/monotouch-samples,davidrynn/monotouch-samples,hongnguyenpro/monotouch-samples,sakthivelnagarajan/monotouch-samples,kingyond/monotouch-samples,peteryule/monotouch-samples,xamarin/monotouch-samples,YOTOV-LIMITED/monotouch-samples,labdogg1003/monotouch-samples,haithemaraissia/monotouch-samples,xamarin/monotouch-samples,hongnguyenpro/monotouch-samples,peteryule/monotouch-samples,andypaul/monotouch-samples,sakthivelnagarajan/monotouch-samples,nelzomal/monotouch-samples,haithemaraissia/monotouch-samples,YOTOV-LIMITED/monotouch-samples,peteryule/monotouch-samples,robinlaide/monotouch-samples,W3SS/monotouch-samples,xamarin/monotouch-samples,markradacz/monotouch-samples,nelzomal/monotouch-samples,andypaul/monotouch-samples,YOTOV-LIMITED/monotouch-samples,W3SS/monotouch-samples,sakthivelnagarajan/monotouch-samples,peteryule/monotouch-samples,labdogg1003/monotouch-samples,albertoms/monotouch-samples,markradacz/monotouch-samples,davidrynn/monotouch-samples,labdogg1003/monotouch-samples,robinlaide/monotouch-samples,kingyond/monotouch-samples,a9upam/monotouch-samples,davidrynn/monotouch-samples,hongnguyenpro/monotouch-samples,iFreedive/monotouch-samples,iFreedive/monotouch-samples,hongnguyenpro/monotouch-samples,haithemaraissia/monotouch-samples,a9upam/monotouch-samples,andypaul/monotouch-samples,W3SS/monotouch-samples,labdogg1003/monotouch-samples,nervevau2/monotouch-samples,albertoms/monotouch-samples,robinlaide/monotouch-samples,markradacz/monotouch-samples,a9upam/monotouch-samples,albertoms/monotouch-samples,YOTOV-LIMITED/monotouch-samples,nervevau2/monotouch-samples,a9upam/monotouch-samples,davidrynn/monotouch-samples