Remove Share Module

[SXiaoXu]

下架第三方分享（分享到微博）的两个方法。方法已经不好用了。文档里面也没有提供第三方分享的流程，鉴于优先级较低，所以决定暂时不开放第三方分享。

+(void)shareText:(NSString*)text andLink:(NSString*)linkUrl toPlatform:(AVOSCloudSNSType)type withCallback:(AVSNSResultBlock)callback andProgress:(AVSNSProgressBlock)progressBlock;

 +(void)shareText:(NSString*)text andLink:(NSString*)linkUrl andImage:(UIImage*)image toPlatform:(AVOSCloudSNSType)type withCallback:(AVSNSResultBlock)callback andProgress:(AVSNSProgressBlock)progressBlock;