add sphere, add camera position by lookAt

it's going to rotate room by rotating camera instead of the room. it's half way.
add cylinder
add cylinder
add cylinder
add light and change camera position

camera position is not final
finilized ccylinder class
add shadow
add cone

refactor cylinder class
add cone

refactor cylinder class
add box
add rid at the end of both side
add 6 directions and rid to the cone
add method which calculates normal

some private methods cross and subtract normalize
draw a simple tetra

direction can be specified but not really flexible
nothing changed
added rotation feature

added some lines for testing Cone, Box, Tetra
moved initilization of camera into reshape method
trying to add shadow mapping but still doesn't work
trying to add shadow mapping but still doesn't work
chage it back to simple version
Merge remote-tracking branch 'origin/master' into Render

Conflicts:
	Group-project/src/Main.java
Merge branch 'Render'