Merge pull request #56 from sutra/master

Fix filename(case-sensitive) of HappyDNS header.

Author: longbai

QiniuSDK/Http/QNSessionManager.m

@@ -14,7 +14,7 @@
 #import "QNResponseInfo.h"
 #import "QNAsyncRun.h"
 #import "QNDns.h"
-#import "HappyDns.h"
+#import "HappyDNS.h"
 
 #if (defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 70000) || (defined(__MAC_OS_X_VERSION_MAX_ALLOWED) && __MAC_OS_X_VERSION_MAX_ALLOWED >= 1090)