changes for hardgame
Merge branch 'master' of
https://github.com/markoboger/de.htwg.sa.sudoku.git

Conflicts:
	de.htwg.sa.sudoku/src/de/htwg/sudoku/controller/impl/GameCreator.java
	de.htwg.sa.sudoku/src/de/htwg/sudoku/solver/HiddenSingleSolver.java
	de.htwg.sa.sudoku/src/de/htwg/sudoku/solver/NakedSingleSolver.java
	de.htwg.sa.sudoku/src/de/htwg/sudoku/solverplugin/SolverPlugin.java