Revert "Issue #86: commented out test_observer.py wholly to test fundamental change made to VideoFrame in 0f8b41faac5a24235a11db41ef6d1b1d46fc9a31"
Revert "Issue #86: commented out test_observer.py wholly to test fundamental change made to VideoFrame in 0f8b41faac5a24235a11db41ef6d1b1d46fc9a31"

This reverts commit 9e839074748f323d9a1a7a8f2bd54a7452837912.

gift-surg/GIFT-Grab,gift-surg/GIFT-Grab,gift-surg/GIFT-Grab,gift-surg/GIFT-Grab