yo git is fixed some more things that nicholas didn't like. there was also an error that caused us to gain more money than we should. Basically "zombie".equals(unit.getTag()) was comparing a string to an enum so it was never true the listener would never get removed and every bullet would add money.
All that is left is buy/upgrade menus and the new Tower.

Added three upgrades using the decorator pattern; damage, fire rate, and range. Added the ability to place new towers with a click and delete towers. Towers will snap to the center of tiles.
And added some new tests.