added jar lib

organized imports

added SetPowerCommand for PhysicsSprites

added PhysicsSprite class to simulate PID

moved grid functions to new GridSprite subclass of Sprite

fixed all sprite bugs

added turnRightCommand, fixed bugged bounding on Sprite

added reset feature to command interface

updated the system of interaction between library and userProgram

Added Practice Site

updated classpath to fix libraries

added more functionality to sprite and empty sample commands

reorganized for easier use by new programmers

refactored commandsutil to commandutils

added commandUtils combine simultaneous and sequential methods