[WEEX-168] [iOS] Animation needLayout may show incorrect
[WEEX-168] [iOS] Animation needLayout may show incorrect

Fix bug when animation's needLayout is true with two animation together.

By fixing the array problem when styles is not single.

close #940

Hanks10100/incubator-weex,miomin/incubator-weex,KalicyZhou/incubator-weex,erha19/incubator-weex,acton393/incubator-weex,KalicyZhou/incubator-weex,alibaba/weex,miomin/incubator-weex,Hanks10100/incubator-weex,alibaba/weex,Hanks10100/incubator-weex,alibaba/weex,alibaba/weex,erha19/incubator-weex,erha19/incubator-weex,cxfeng1/incubator-weex,miomin/incubator-weex,KalicyZhou/incubator-weex,miomin/incubator-weex,cxfeng1/incubator-weex,Hanks10100/incubator-weex,miomin/incubator-weex,cxfeng1/incubator-weex,Hanks10100/incubator-weex,acton393/incubator-weex,erha19/incubator-weex,alibaba/weex,KalicyZhou/incubator-weex,erha19/incubator-weex,miomin/incubator-weex,cxfeng1/incubator-weex,acton393/incubator-weex,alibaba/weex,acton393/incubator-weex,KalicyZhou/incubator-weex,cxfeng1/incubator-weex,Hanks10100/incubator-weex,miomin/incubator-weex,erha19/incubator-weex,KalicyZhou/incubator-weex,acton393/incubator-weex,acton393/incubator-weex,alibaba/weex,acton393/incubator-weex,erha19/incubator-weex,Hanks10100/incubator-weex,Hanks10100/incubator-weex,erha19/incubator-weex,acton393/incubator-weex,miomin/incubator-weex,cxfeng1/incubator-weex