LevelsGroup added (not working)
--
Merge branch 'dev' of https://github.com/hmmvot/somegame into dev
Added LevelsManager.
Fixed LevelsManager and LevelBuilder.
--
Fixed Level1.js. Added second level. Activated MainMenuScene. Added list of levels in MainMenu. Added 'create' methods for scenes.
Fixed LevelBuilder.
Added levels.
Merge branch 'dev' into gh-pages