Added Selection Change and Improved Vertex Shader

currObject can now be changed using “tab” for forwards and “ ` ” for
backwards.  Vertex Shader was improved by making specular only
calculate when necessary rather than changing it to zero after
calculations have been done.
Implemented Scrolling to Switch Objects

Scrolling works alongside using keys however there is still no visual
feedback.  Scrolling only works to change selected object when
MODE_SELECT is set to 1.
Merge pull request #9 from Callum-/master

update
stuff