lib/matrix.js missing from gles demos

[cscott]

The demos in examples/gles try to load lib/matrix.js via the common.js file. matrix.js is missing from lib/ -- probably you forgot to check it in?

[cscott]

In fact, commit 37e03dc seems to be the guilty party: you removed the matrix stuff from common.js, but didn't add the new lib/matrix.js file.