Added some medic vehicle skins

Added some medic vehicle skins
Changed cop weapons / stopped players ejecting from vehicle when downed.

Added sting 9mm as rubber bullet gun and katiba as live rounds weapon.
Also added frag grenades and removed 6.5mm silencer at rebel gun shop.
removed the code that made players eject from vehicle when downed Fixes
#12
Added the ability to purchase .50cal offroad and HMG hunter

Added the ability to purchase .50cal offroad and HMG hunter
Merge remote-tracking branch 'origin/master' into SrgFlip