edit window started
non functional gui kinda done

	modified:   LiveDescribe/LiveDescribe/Windows/DescriptionEditViewModel.cs
	modified:   LiveDescribe/LiveDescribe/Windows/DescriptionEditWindow.xaml
	modified:   LiveDescribe/LiveDescribe/Windows/DescriptionEditWindow.xaml.cs
trying to get Description Canvas to display descriptions
finally understand how to get the boxes in the timeline to show up
got the canvas working and the description alligning left
description canvas now asks for split and trim
	modified:   LiveDescribe/LiveDescribe/Windows/DescriptionEditViewModel.cs
	modified:   LiveDescribe/LiveDescribe/Windows/DescriptionEditWindow.xaml
	modified:   LiveDescribe/LiveDescribe/Windows/DescriptionEditWindow.xaml.cs