Merge pull request #1 from metaxy/master

wow
wow2
code wiederhergestellt
coolio
Kugel auf die near plane gezeichnet, wo der Mauszeiger hintrifft.
GLM Bibliothek hinzugefügt
Trackball radius added
Trackball added
New rotation mode added
Implemented reset method
Implemented Picking
Trackball & Picking added
Added Ex2
Finished robot
Bounding sphere drawing fixed
test
merge