fixed null pointer exception in PShader

git-svn-id: http://processing.googlecode.com/svn/trunk@10803 fe3ceab9-de17-3b67-bb2e-7d58edd5e4d6
Added a couple of LWJGL examples

git-svn-id: http://processing.googlecode.com/svn/trunk@10804 fe3ceab9-de17-3b67-bb2e-7d58edd5e4d6
Propper use of PShape.setStroke()

git-svn-id: http://processing.googlecode.com/svn/trunk@10805 fe3ceab9-de17-3b67-bb2e-7d58edd5e4d6