made solver interruptible
added class Solution
added class GameProgress
started to integrate the solver into the GUI
(use PropertyChangeEvent to notify GUI when the solver thread found a solution)
show solver results in GUI
integrated solver results into GUI
improved GUI: added color buttons and keyboard input
added GUI localization (currently English and German)
model separation: GameState, GameProgress, GamePreferences
added settings dialog (currently for width / height of board only)
added color schemes to settings dialog
release 0.1
release 0.1.1
bugfix: settings dialog, use new color scheme on OK button, not before
use Java 6
release 0.1.2
improved settings dialog
(set size and position each time it is shown; hide on ESC key)
improved settings dialog
(create a new board only when board width or height have been changed)
run the solver strategies in parallel threads
fixed FindBugs warnings