1.竖版计算器增加删除按钮；2.更换icon；3.手电筒按钮加入按键声音
Merge branch 'master' of https://github.com/kevinva/ToolBox

Conflicts:
	UsefulBox.xcodeproj/project.pbxproj

UsefulBox.xcworkspace/xcuserdata/kevinh0.xcuserdatad/UserInterfaceState.
xcuserstate
	UsefulBox/ButtonPlayer.h
	UsefulBox/ButtonPlayer.m
	UsefulBox/MainViewController.m
	UsefulBox/TranslationViewController.m