Minor Fixes and a bonus!

1.  Plasma can no longer be used to make doors, which will no longer
explode.
2.  Runner HUD update test
3.  Marine knives can now be held in their mouth, giving the marine a
70% badass bonus
Merge remote-tracking branch 'upstream/master'
Merge pull request #110 from apophis775/master

Minor Fixes and a bonus!