Add field in html and basic style
Add script structure with some descriptions
Add module key to watch pressed buttons
Add basic piece factory
Add basic draw function with style class management
Add basic game state global object and coord system
Add initial getRandomPiece function
Add special style classes for next and current pieces
Add draw current piece function

Turned draw function into a module which should include all draw
functions.
Replace clearCurrentPiece with more general clearPiece
Add draw next piece function
Add fixed piece function
Add move left function
Add move right function
Add move down function
Add pivot point shift into left, right and down moves
Add up (rotate) move function
Add minor bug fix in draw fixed function

Conflicts:
	script.js
Add basic time tick function
Add minor bug fix in draw fixed function