Flag for modification on CollectionChanged
Fix issue on closing window...

after closing unsaved project
Merge branch 'master' of github.com:IMDC/LiveDescribe-Desktop into valdev
Fix bug with timeline line setting
fixed several issues with smaller videos

- number timeline and description canvas needed to be left aligned
- you cannot click outside the ending of the video in the number timeline
- bug found when dragging marker to end of video and pressing play
marker keeps on going