Create one scene per level and add new level 3.
Merge branch 'master' of https://github.com/andreiagaita/PersonalSpaceInvader

Conflicts:
	Project1/Assets/Scenes/Level1.unity
	Project1/Assets/Scenes/Level2.unity
Merge branch 'master' of https://github.com/andreiagaita/PersonalSpaceInvader