Merge pull request #3 from munraj/master

Bugfix in moveLeft() in World.java
Disabling the useless threads, getting rid of synchronized methods.
A small efficiency improvement
TEMPORARY COMMIT, DO NOT USE!
Investigating sluginess (note rotation does not work)
Rotation bug fixed
Rotation bug fully fixed, slightly faster?
Intoducing a script that pushes pieces as deep as possible
Merge pull request #4 from adscib/master

Sample script added.
Adding state mutating methods to World, gameover bug fixed.
Ruletris v0.2 - moveDown(), getX/Yoffset added, bugs fixed - GAME OVER, counters and others
Merging Ollie's work
Fixing few bugs
Even less bugs
Single line push roll-back
Single line push now works properly, but is not visualized properly.
Singl line push works, but not visualized properly
Always dropping a whole piece bug now fixed. NOTE: the piece is still put in offset 4 0 but not painted, if moved and successfully dropped game continues, otherwise GAME OVER.
Level objectives update