Observe changes to flashMode and torchMode + create delegate method visionDidChangeFlashMode:
Listen for the delegate inside PBJViewController
Merge pull request #105 from jeffaburt/flash-mode-delegate

Flash mode delegate
podspec, bumped to v0.1.8
updated readme
Update README.md
PBJVision, removed some white space
PBJMediaWriter, add timestamp bookkeeping
PBJVision, adopt utility method that sets duration
PBJVision, refactor to use new MediaWriter properties
Project, update project files to latest Xcode version check