test_sprite_loader gets image from AnimationSprite
rearranged sprites into animation and collision types
moved sprite_list.txt files to new directories
updated sprites directory
calls the update method on the  drawable_sprite_group member
calls convert_alpha() instead of convert() when loading the images into pygame Surfaces
uses masks to handle hit collisions
updated path to sprites file
added test_attack_object.py in order to test this class
updated sprite list to reflect recently added sprites
updated attack collision sprites and list
added clear() and len() methods
fixed bugs and typos in the attack related classes after testing
minor changes to adapt to the changes in the attack class
shows animation and collision sprites
moved sprites_list.txt to the animation folder