Merge pull request #5 from najezenejjezek/master

another merge
 pridana reakce  poskozeni lodi na strely, opraven bug sirky aktivni herni plochy pri vytvareni nove hry, pridan efekt zniceni strely a lodi, pridany zvuky strely, lode, pozadi, pridano tlacitko ovladani zvuku do menu
Merge remote-tracking branch 'upstream/master'

Conflicts:
	www/script/main.js
	www/script/shoot.js