Complete chapter 6
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Merge branch 'master' of https://github.com/pitsanu/Lab_IosGameByTutorial

* 'master' of https://github.com/pitsanu/Lab_IosGameByTutorial:
  Complete chapter 6

Conflicts:
	AvailableFonts/AvailableFonts.xcodeproj/project.xcworkspace/xcuserdata/tom.xcuserdatad/UserInterfaceState.xcuserstate
	AvailableFonts/AvailableFonts/AvailableFonts-Info.plist
	AvailableFonts/AvailableFonts/MyScene.m
	AvailableFonts/AvailableFonts/ViewController.m
	XBlaster/XBlaster.xcodeproj/project.pbxproj
	XBlaster/XBlaster.xcodeproj/project.xcworkspace/xcuserdata/tom.xcuserdatad/UserInterfaceState.xcuserstate
	XBlaster/XBlaster/Bullet.m
	XBlaster/XBlaster/Entity.h
	XBlaster/XBlaster/Entity.m
	XBlaster/XBlaster/MyScene.m
	XBlaster/XBlaster/PlayerShip.m
	XBlaster/XBlaster/ViewController.m
	XBlaster/XBlaster/XBlaster-Info.plist
	XBlaster/XBlaster/XBlaster-Prefix.pch