fixed issue of multiple items being added to undoredo manager when deleting description
changed undoredo with startinvideo and endinvideo textbox editing
changed stack to a list
added ability to view the location of the descriptions
Merge branch 'master' of github.com:IMDC/LiveDescribe-Desktop into valdev

Conflicts:
	LiveDescribe/LiveDescribe/Resources/UiStrings/UiStrings.resx