Better Euler Angle camera

Move Euler Angle camera out to see rings at start.
Add "path" for ease of local debugging

Set path at top of code to "" to use textures locally.
Properly offset grid

Use PolygonOffset so that the grid will properly be above the plane.
Make Github code match code on Udacity site
Merge pull request #16 from erich666/master

Euler fix, offset grid fix, easier texture debug