Simple Background, Ship and flame particle tweaks.

* Background: On separate camera. simple stars. further effects could be
added.
*Ship model: had annoying white outlines behind the lines on the wings
and body. white outlines removed.
*Thruster flame looked too big for ship. Appeared in front of it and was
going out of the left side of the screen. Smaller flame effect. Public
variables to control thruster flame particle effect exposed. Current
values of 200/100.