Added base PictureList, refactored ImageAdapter to PictureAdapter
Added more methods (setters/getters) to PictureList
Merge branch 'master' into PictureListRefactor

Conflicts:
	src/ca/ualberta/cs/taggingapp/models/Picture.java
Added dummy factory
Fixed factory to get downsized image
Implemented new PictureList model
Merge branch 'PictureListRefactor'