Little tweaks:

 * Made the loaded area larger
 * Tried to fix onGround() a little bit
 * Now prefering to reset the player in the middle of the loaded area to prevent loading chunks
 * Can always jump now - onGround() does not work :/
BUG: when jumping with onGround() enabled, it does sometimes not jump though on ground!
Added BUGS file.
Merge branch 'master' of https://github.com/m-bra/Blocks