renamed example

Signed-off-by: Matthias Rohrbach <m.rohrbach@robandrose.ch>
new example

Signed-off-by: Matthias Rohrbach <m.rohrbach@robandrose.ch>
added example for testing ray triangle intersection

Signed-off-by: Matthias Rohrbach <m.rohrbach@robandrose.ch>
ray triangle toxi version, but not yet ok

Signed-off-by: Matthias Rohrbach <m.rohrbach@robandrose.ch>