got rid of some redundancies
when marker plays description it gets highlighted
description stops now upon stopping the video
Merge branch 'valdev' of https://github.com/vserrago/LiveDescribe-Desktop into danieldev

Conflicts:
	LiveDescribe/LiveDescribe/Model/Description.cs
	LiveDescribe/LiveDescribe/View Model/MainWindowViewModel.cs
Merge branch 'master' of github.com:IMDC/LiveDescribe-Desktop into valdev
renamed View Model directory to ViewModel
Kind of fix issue with making paths
Fix issue with referrencing a non-copied video

Non-copied videos should now work, as long as it is created from a new
project.
Fix null reference exception

Happens when the description file can not be found, and therefore not
played, but tries to stop it anywyas.
Description file locations are stored set by...

relative value now.