Yang: complete the method for downloading photos those in photosets.
Merge branch 'master' of github.com:yang030405/flickrbox
Yang: complete download for those photos in photosets.

Conflicts:
	src/main/java/com/flickrbox/dao/impl/AuthDAO.java
	src/main/java/com/flickrbox/service/AuthService.java
	src/main/java/com/flickrbox/service/PhotoService.java