This note might not be necessary, but it is here nevertheless.
Please ignore the CC Attribution-Noncommercial-Share Alike license at the bottom of every page.
While it is commendable for people to give books and software away, it is also true that “a worker deserves his wages.”
So instead of the license linked to at the bottom of every page, the author (Andrew) would like to retain the right to possibly use any posted/written content for commercial purposes later. Others are welcome to use this content (with attribution) with or without modifying it, for non-commercial purposes.