New models

Oxygen, Hydrogen, CO2, Methanal
Added HUD mission message
Hud Message displays for first 10 sec only of gameplay.
Objective message is displayed for first 5 seconds and then 5 seconds after hitting the h key.
Merge pull request #14 from themolecularmoose/user-story-21

User story 21
Added a bunch of collectables

also fixed methane (needed to update main scene to), made collectables
asset folder
forgot to add this oxygen prefab update
Chem Wars Episode 6: The Death of Darth Vader. Also some tractor beam stuff
Logic for tractor beam. Beam starts at 100 energy and 10 energy is used for every molecule picked up. Base drop off area restores energy to 100.
Added 3 spinning obstacles.
Added lighting
Obstacles are now bright pink, long, and thin. There are also more of them.
number of items on tractor beam has picked up on HUD. No pictures just yet
committing meta files
Merge pull request #16 from themolecularmoose/US13-Adding-Obsticles

Us13 adding obsticles
Merge remote-tracking branch 'origin/master' into user_story_15

Conflicts:
	unity-project/Assets/Scenes/main_game.unity
from master
Merge pull request #15 from themolecularmoose/user_story_15

User story 15
Fixing merge conflict and merging with master
Merge pull request #18 from themolecularmoose/US23-also-darthvader

Us23 also darthvader