Fix issue #1
Merge branch 'master' of https://github.com/ElvinJin/Video-Background

Conflicts:

VideoBackground.obj/VideoBackground.obj.xcodeproj/project.xcworkspace/xc
userdata/pjin.xcuserdatad/UserInterfaceState.xcuserstate

VideoBackground.swift/VideoBackground.swift.xcodeproj/project.xcworkspac
e/xcuserdata/pjin.xcuserdatad/UserInterfaceState.xcuserstate