added welcome screen with a segue to the video manager view.
added bpmLabel in video manager view.
updated the if condition in Algorithm:bpmLatestResult().

set the storyboard to be configured as the main app UI which solved the “app delegate” problem.
added a “Turn off flash” button in Video Manager view in the Storyboard and connected it to a method turnOffFlash in Video Manager Controller
Storyboard:
added tab bar controller and 2 tabs:
1) the heart rate “calculator” tab
2) a settings tab and it’s corresponding settingsViewController:UITableViewController. it’s embedded in a navigation controller and contains a static-style table view.
add a factor that should decrease the error caused by missing peaks
changed latest bpm result to be CGFloat