Several code style changes.
Move draw logic to Character.
Rename method checkValue to checkValueInRange.
Random is instance variable now.
Updated distance calculation algorithm in getDistanceToSnake method.
Fix #14 (Wrong distance algorithm usage)
Used sum distance calculation d = dx + dy instead of true distance algorithm
d = sqrt (dx*dx + dy*dy)
 because Snake can not move diagonally.
Merge pull request #18 from splavs/dev

Dev