Updated with latest locations for the ES2/ES3 header files.

Hooray, they've changed it again!

One point of controversy that I think you'd like to take a look at. The extension header file for ES3 is now the same as the one for ES2, and the path to it is the same as ES2 as well.

As seen here: http://www.khronos.org/registry/gles/#headers3

"\<GLES2/gl2ext.h\> OpenGL ES 2.0 and 3.0 Extension Header File (this header is defined to contain all extension interfaces for both OpenGL ES 2.0 and 3.0, since OpenGL ES 3.0 is backward-compatible with OpenGL ES 2.0)."

If there's anything else that needs to be done to this script to make this work, let me know. Thanks!