Copypasta'd the grenade dud fix
Merge pull request #174 from 4950/Michael/XNA_GrenadeDudFix

Copypasta'd the grenade dud fix
Here is version 2 of the scenario loading that I was working on for the past couple of days. I still have some changes I need to do to it like the modifier value.
Merge pull request #175 from 4950/poetter/scenerioV2_XNA

I figured that this should be put in sooner rather than later. So people can play with it.