A lot of new features as well as som bug fixes.

* Better image handling through the asset manager
* Levels can be grouped in a package
* Implemented an early form of states, such as menu, shop and in-game
* Added a loading screen with a loading bar for loading levels
* Improved page-to-page interaction, and added a few new pages
* Added ability to provide arguments when loading audio
* Added inital start-up screen instead of the level menu
* Added an  auto-save system using localStorage
* Improved the level system
* Added backgrounds and background-handling for the new states
* Added the ability to mute audio
* Added a tileset for Blub, instead of a single sprite
* Added a back button and a reset button
* Started working on the shop system and improved upgrades