Added .vcds from all the singleplayer games in the SDK
Added skill cfg files so that refilling ammo will work.
Added .vcd files from lost coast
Revised the contribution guidelines to encourage more interaction within the community.
Added bloom shader and screenspace effect helpers as examples for the SDK.
Finished updating physics module and is now usable. VPhysicObjects can be retrieved from an entity. The object lifetime is tied to the entity (as long as the entity is alive and the entity VPhysicsGetObject function returns the same object, the wrapper physics object will be valid.
Merge remote-tracking branch 'upstream/master'