15cc74aa05035d6e3dc81138f7ce303dc0fab445

relative db and condition class

a53e0049806f0b34f087603c99fbd1fa73ca103f

removed active_support dependency by creating own 'core_ext' file

9c2647846ff3e828de6fd78f60f55fc5f0ccf68b

minor changes

99b5ad89479b1758859098905b6f83342c9cd8fe

added exit button

cc99f1881664b94f06ce7ebf5762c20b7479bc2a

added more checking for board validity

f6e04eb8f9be73fc6b8e0c84ed8dd39555e50cd0

layout adjustments

f26242ea2df75159c9a236ed884ebb53fbd7c162

added buttons to load the sample boards and to reset/clear the board

dafc0477f6c701ee8450228b25f6dc3d959a0903

placed solution timeout code in Sudoku::Board