Updates todo list

If you have any more optional tasks, add them to the todo list
Fixes level generation, modifies second level to bg2. Modifies main menu sizes and navigation.
Fixes menu, adds how to play text, adds obstacles to screen with collision detection, test on first level. adds rock images. adjusts global variables.
Updates todo list
Fixed enemy movement when goku's colliding. Fixed obstacle collisions to respond correctly.
Merge remote-tracking branch 'origin/master'
preliminary to super saiyan transformation.
Updates todo list
revises todo list
Adds to readme
Merge remote-tracking branch 'origin/master' into Steve
adding obstacles to level 1