Originally Goldsword44's JunkRails

Updated rails a little; original rails submitted to Goldsword were slightly too green when applied with factorio lighting.

Added junk train stops and junk signals which can only be applied to junk rails. (These are cheaper and earlier than original train stops)

Without Train Speed Limiter junk rails are the same as normal rails, so the cheaper rails, stops and signals are somewhat of a cheat.

• 0.0.903 Updated to factorio 0.16