Add Fire, Rotation. Document Health, Hunger, Position, Velocity

components-system branch: Big thanks to @Zidane for starting components up
Documented some values with "value in {link org.spongepowered.api.math.Vector3i Vector3i}" due to the fact that new people may not be used to using Vector3i
Did I miss the point?
Also @Zidane created a type class ...
https://github.com/SpongePowered/SpongeAPI/blob/component-system/src/main/java/org/spongepowered/api/component/entity/type/neutral/Enderman.java
I expected more a Type/Render/Model-Class with an id/enum, similar to @spaceemotion