Bug in PhotosInterface.getImageAsStream(Photo photo, int size)

```
In PhotosInterface.java,

There is missing "else" keywords in the function getImageAsStream.

"if" is used instead of "else if" two times, which can lead to raise a 
FlickrException, when passing size Size.SQUARE for instance.


```

Original issue reported on code.google.com by `benoit.m...@gmail.com` on 19 Dec 2014 at 3:40
