Update Tetengo2 #91
Implement test_bobura::view::diagram::header and so on #91
Implement test_bobura::view::diagram::station_line and so on #91
Implement test_bobura::view::diagram::time_line and so on #91
Implement test_bobura::view::diagram::train_line and so on #91
Skip a segmentation fault on Cygwin #91
Merge branch 'test_virtual'