tutorial4: additions to tutorial3

[Greg DeKoenigsberg]

1. My clever little hack for making an "ascii art" level was
completely unnecessary -- there was already an asciiArtToMap()
function in the help.js file that I hadn't found yet. Which I
discovered when I said to myself "this really should be a library.
Let me go put it in... let's see, a helper function, so it should
probably go in help.js, right next to, let's see... LOL! I'm an
idiot."

2. Blocks are now lined up in a row.

3. Blocks can no longer be pushed to the edge.

Later this week: a level that has multiple rooms like this, where you
must complete all of the puzzles to get out. Ideally completely
autogenerated with a few parameters.

Still a primitive look and feel, but again, at this stage I'm fleshing
out simple gameplay routines with good documentation for potential
copycats.

--g

[Greg DeKoenigsberg]

Oh, urls:

http://gregdek.org/MONGO/akihabara/game-tutorial4.html
https://github.com/gregdek/akihabara/blob/master/resources/tutorial4/bundle-map-begin.js

--g