Added PBJVisionVideoCapturedDurationKey metadata on saved video
It's done  because at the moment, when video is done recording there's no other way to get it's duration
Useful when you have some restrictions on the minimum recorded video duration
Merge pull request #133 from PaulTaykalo/master

Fix for correct maximum capture duration
Merge pull request #134 from PaulTaykalo/additional-metadata

Added Captured video duration metadata when video is saved
Podspec, bump to 0.2.1
maximumCapturedDuration should reflect the captured duration, not time passed since start

Revert "Fix for correct maximum capture duration"

This reverts commit 1048438db3c8d79b19d65f25001fdc73cbc03022.
PBJVision use currentTimestamp for uninterrupted recording, fixes GH-136
PBJVision, fix current time calculation for maximum duration