Alan iOS SDK v2.6

• Deprecation for AlanButton methods:

- (void)setVisual:(NSDictionary *)data;

- (void)playData:(NSDictionary *)data;

- (void)call:(NSString *)method withParams:(NSDictionary*)params callback:(void(^)(NSError *error, NSString *object))callback;

• Added AlanButton methods:

- (void)setVisualState:(NSDictionary *)visualStateData;

- (void)playCommand:(NSDictionary *)command;

- (void)callProjectApi:(NSString *)method withData:(NSDictionary*)data callback:(void(^)(NSError *error, NSString *object))callback;