fix ios Code Signing bug

[huang303513]

when use Code Signing. iOSSDK has ignore the follow files for compute hash:

4. NSString * const IgnoreMacOSX= @"__MACOSX/";
5. NSString * const IgnoreDSStore = @".DS_Store";
6. NSString * const IgnoreCodePushMetadata = @".codepushrelease";

so, we need igore file in the serverSDK.

relative bugs

[huang303513]

本地验证通过。

[huang303513]

#182 has fix the same problem