ERT update V2

Adds new ERT uniforms, and makes ERT members spawn with them.

![](http://puu.sh/aT10L/9e8c3adaa6.png)

Adds lockers with the new uniform, the old uniform, and the combat turtleneck to the ERT base. 

Adds new in-atmosphere ERT helmets and armor, and adds them to the ERT base. Their protection values match the tactical armor, without the slowdown.

![](http://puu.sh/aUjKA/b8ddf4079d.png)

Adds new ERT backpacks (sprites by PlasmaRifle) to the ERT base, removes the satchel from the ERT spawn.

![](http://i.imgur.com/FPf9yah.png)

Fixes some minor spelling errors.