new c# movement script, death animations, and player "dies" at 0 health
Merge branch 'master' of https://github.com/FourierTransformer/tower-offense into ben/damage-system
made arrows (though 3d rigid body, not 2d) and they move up by default
arrows are now in 2d instead of 3d
arrows fire, but only north
arrows now fire from player to arrow.  archer sprite sheet was also missing for me, so re-added sprite sheet.
re-added archer animations
playing around with collisions and other slight code changes
arrows are now destroyed when hitting npcs
arrows are now destroyed when hitting walls (ugly code)
enemies now have health and arrows destroy enemies
Merge pull request #17 from FourierTransformer/ben/damage-system

Ben/damage system