Force close the new-instance window

[README] update for 0.8.0

'strip' target is only for Linux

generate and distribute credits.html

[WIN] fix logging initialization; SEGV on start

bump version to 0.7.1

bump version to 0.7.0

bump version to 0.6.3

Fix 8247d63 for Win

send App.quit correctly when the last window closed