there. >_< )

Changed the reference to the lesson's README file -- it's not "this file" any more (this file is LAYOUT.md). 

Also removed the ">"s from the beginning of the block of text to be included in the README, to enable copying-and-pasting (and because the ~~~ should offset the quote by itself. I hope.

what it's for and how to edit it for each lesson.

All classes **must** be explicit because this will make easy
to translate the lessons.

Close #116.

1.  Moving the build steps up to the top of `README.md`.
2.  Removed the misleading target to run the checking tool (since the tool doesn't actually work).