added gameover screen
When game state is set to gameover, the gameover screen is displayed
Debug
Building now heals durability when supplied with power
update function no longer does anything when gamestate is game over. Also sets gamestate to gameover if player is dead
hud buttons nolonger does anything when gamemode is gameover
Added game state checks on touchEnd
Changed design and added instructions
Merge branch 'master' of https://github.com/kpro-gr10/Power-Supply
Changed colors in gameover
Merge branch 'master' of https://github.com/kpro-gr10/Power-Supply into powerlines

Conflicts:
	www/js/views/hud.js
	www/js/views/screen.js