First changes for mouse interaction.

BUGS:
  * rotation in y-axis goes wrong (object rotates in other than 0.0
axis)
resolve the camera problem - without using gluLookAt function.
Adding accessor methods to rotating camera.
Resolved problem with non-recognized NULL value (changed to 0x00)
Repiar the problem with rotation (camera). Changed axis.
Moving camera with mouse.
Repiared perspective and added floor to program ;)