Fixed grunts only moving diagonally
Invulnerable Hulk enemy type added
Basics for level generation added
Merged the weekend's remote changes...

Merge branch 'master' of https://github.com/Ernir/robotron

Conflicts:
	entities/Grunt.js
Attempting to bring master changes into the enemies-ernir branch...

Merge branch 'master' into enemies-ernir

Conflicts:
	ROBOTRON.js
	managers/entityManager.js
Conflicts from bad merging (hopefully) resolved...
Enemy inheritance model fixed by adding a common parent.
Hulks made less accurate.
Merge branch 'master' of https://github.com/Ernir/robotron
Merge branch 'master' into enemies-ernir
Hulks made to follow family members
Explanations of enemy AIs added, placeholders for non-implemented enemies
Check added to avoid error when nothing but Hulks are on the field
Player rendering added again