Add multiphoto for mobile post. Close #4053

#4053

![Pantallazo-1](https://f.cloud.github.com/assets/1108789/283266/83efeb22-91a9-11e2-831b-0bdd1ddb1dc5.png)

![Pantallazo](https://f.cloud.github.com/assets/1108789/283265/809e03be-91a9-11e2-9cd2-a77b71dfa5e0.png)