Sha..om cebf822f0e * Added check for unit vector in Ray.setDirection()
* Changed Ray constructor to set direction to 0, 0, 1 to satisfy above requirement
 * Ray no longer steals references

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@8859 75d07b2b-3a1a-0410-a2c5-0572b91ccdca
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